You could use https://forum.plutonium.pw/topic/17548/linux-windows-server-updater to still keep getting updates.
It by default only checks file hashes when a new version has been released, and can also skips launcher files, although I'd recommend against skipping the launcher files.
You could do something like this, if you drop the latest .exe in to %localappdata%\Plutonium\bin
set plutopath=%localappdata%\Plutonium\
%plutopath%bin\plutonium-updater.exe -l -d %plutopath%
start "" "%plutopath%bin\plutonium-launcher-win32.exe"
-l makes the updater check the launcher files, but only if a new plutonium revision has been released, I'd recommend keeping it so the launcher doesn't break if theres an update for it.