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Vim, 39 bytes

:im hello hello:se noma
:map : i
i

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:im hello "Remap 'hello' in insert mode to
 hello "write hello, then hit escape
 :se noma "then set the buffer to not-modifiable
:map : i "THEN remap ':' to 'i' so that can't be changed
i "enter insert mode and await an infinite stream of input