Methanol in small doses should be OK but it can be corrosive and leach plasticizers from "rubber" parts. Modern cars seem to handle MeOH much better than classics.
Ethanol in small doses will work great. If you can get 90+% EtOH, I'd go with that instead of MeOH.
Not sure about IPA. Might be able to get some idea of suitability by looking up properties in "CRC Handbook of Chemistry and Physics" (if you're doing HPLC, you probably have one handy) and comparing to MeOH and EtOH.
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