For what it's worth, in all my Minis and Mokes over the last 30 odd years, I've never had a By-pass Hose and Never drilled the Thermostat (which to some degree over-rides it's purpose). No issues other than the cooling system takes a little longer to fill.
but they will have the standard hole with wiggly thing in it
Yes and they are made that way.
there were/are some that do not have that hole with wiggly thing and that could cause issues.