Type in toki pona and it copies the UCSUR to your clipboard

ucsur.py

import pyperclip
dic = [
    ("A","\U000F1900"),
    ("AKESI","\U000F1901"),
    ("ALA","\U000F1902"),
    ("ALASA","\U000F1903"),
    ("ALE","\U000F1904"),
    ("ANPA","\U000F1905"),
    ("ANTE","\U000F1906"),
    ("ANU","\U000F1907"),
    ("AWEN","\U000F1908"),
    ("E","\U000F1909"),
    ("EN","\U000F190A"),
    ("ESUN","\U000F190B"),
    ("IJO","\U000F190C"),
    ("IKE","\U000F190D"),
    ("ILO","\U000F190E"),
    ("INSA","\U000F190F"),
    ("JAKI","\U000F1910"),
    ("JAN","\U000F1911"),
    ("JELO","\U000F1912"),
    ("JO","\U000F1913"),
    ("KALA","\U000F1914"),
    ("KALAMA","\U000F1915"),
    ("KAMA","\U000F1916"),
    ("KASI","\U000F1917"),
    ("KEN","\U000F1918"),
    ("KEPEKEN","\U000F1919"),
    ("KILI","\U000F191A"),
    ("KIWEN","\U000F191B"),
    ("KO","\U000F191C"),
    ("KON","\U000F191D"),
    ("KULE","\U000F191E"),
    ("KULUPU","\U000F191F"),
    ("KUTE","\U000F1920"),
    ("LA","\U000F1921"),
    ("LAPE","\U000F1922"),
    ("LASO","\U000F1923"),
    ("LAWA","\U000F1924"),
    ("LEN","\U000F1925"),
    ("LETE","\U000F1926"),
    ("LI","\U000F1927"),
    ("LILI","\U000F1928"),
    ("LINJA","\U000F1929"),
    ("LIPU","\U000F192A"),
    ("LOJE","\U000F192B"),
    ("LON","\U000F192C"),
    ("LUKA","\U000F192D"),
    ("LUKIN","\U000F192E"),
    ("LUPA","\U000F192F"),
    ("MA","\U000F1930"),
    ("MAMA","\U000F1931"),
    ("MANI","\U000F1932"),
    ("MELI","\U000F1933"),
    ("MI","\U000F1934"),
    ("MIJE","\U000F1935"),
    ("MOKU","\U000F1936"),
    ("MOLI","\U000F1937"),
    ("MONSI","\U000F1938"),
    ("MU","\U000F1939"),
    ("MUN","\U000F193A"),
    ("MUSI","\U000F193B"),
    ("MUTE","\U000F193C"),
    ("NANPA","\U000F193D"),
    ("NASA","\U000F193E"),
    ("NASIN","\U000F193F"),
    ("NENA","\U000F1940"),
    ("NI","\U000F1941"),
    ("NIMI","\U000F1942"),
    ("NOKA","\U000F1943"),
    ("O","\U000F1944"),
    ("OLIN","\U000F1945"),
    ("ONA","\U000F1946"),
    ("OPEN","\U000F1947"),
    ("PAKALA","\U000F1948"),
    ("PALI","\U000F1949"),
    ("PALISA","\U000F194A"),
    ("PAN","\U000F194B"),
    ("PANA","\U000F194C"),
    ("PI","\U000F194D"),
    ("PILIN","\U000F194E"),
    ("PIMEJA","\U000F194F"),
    ("PINI","\U000F1950"),
    ("PIPI","\U000F1951"),
    ("POKA","\U000F1952"),
    ("POKI","\U000F1953"),
    ("PONA","\U000F1954"),
    ("PU","\U000F1955"),
    ("SAMA","\U000F1956"),
    ("SELI","\U000F1957"),
    ("SELO","\U000F1958"),
    ("SEME","\U000F1959"),
    ("SEWI","\U000F195A"),
    ("SIJELO","\U000F195B"),
    ("SIKE","\U000F195C"),
    ("SIN","\U000F195D"),
    ("SINA","\U000F195E"),
    ("SINPIN","\U000F195F"),
    ("SITELEN","\U000F1960"),
    ("SONA","\U000F1961"),
    ("SOWELI","\U000F1962"),
    ("SULI","\U000F1963"),
    ("SUNO","\U000F1964"),
    ("SUPA","\U000F1965"),
    ("SUWI","\U000F1966"),
    ("TAN","\U000F1967"),
    ("TASO","\U000F1968"),
    ("TAWA","\U000F1969"),
    ("TELO","\U000F196A"),
    ("TENPO","\U000F196B"),
    ("TOKI","\U000F196C"),
    ("TOMO","\U000F196D"),
    ("TU","\U000F196E"),
    ("UNPA","\U000F196F"),
    ("UTA","\U000F1970"),
    ("UTALA","\U000F1971"),
    ("WALO","\U000F1972"),
    ("WAN","\U000F1973"),
    ("WASO","\U000F1974"),
    ("WAWA","\U000F1975"),
    ("WEKA","\U000F1976"),
    ("WILE","\U000F1977"),
    ("NAMAKO","\U000F1978"),
    ("KIN","\U000F1979"),
    ("OKO","\U000F197A"),
    ("KIPISI","\U000F197B"),
    ("LEKO","\U000F197C"),
    ("MONSUTA","\U000F197D"),
    ("TONSI","\U000F197E"),
    ("JASIMA","\U000F197F"),
    ("KIJETESANTAKALU","\U000F1980"),
    ("SOKO","\U000F1981"),
    ("MESO","\U000F1982"),
    ("EPIKU","\U000F1983"),
    ("KOKOSILA","\U000F1984"),
    ("LANPAN","\U000F1985"),
    ("N","\U000F1986"),
    ("MISIKEKE","\U000F1987"),
    ("KU","\U000F1988"),
    ("PAKE","\U000F19A0"),
    ("APEJA","\U000F19A1"),
    ("MAJUNA","\U000F19A2"),
    ("POWE","\U000F19A3")
]
dic.sort(key=lambda p:len(p[0]),reverse=True)
sym = str.maketrans({
"(": "\U000F1990",
")": "\U000F1991",
"^": "\U000F1992",
#F1993  SITELEN PONA START OF LONG PI
"_": "\U000F1994",
"-": "\U000F1995",
"+": "\U000F1996",
"[": "\U000F1997",
"]": "\U000F1998",
"~": "\U000F1999",
"{": "\U000F199A",
"}": "\U000F199B",
".": "\U000F199C",
":": "\U000F199D"
})
while True:
    stc = input().lower().translate(sym)
    for k,v in dic:
        stc = stc.replace(k.lower(),v)
    pyperclip.copy(stc.replace(" ",""))

PS: START OF LONG PI is commented because it's deprecated in favor of the generic long glyph starter.