If you have powder then it doesn't really matter.
Polar solvents are only an issue with foam extinguishers. In this case the effect will be based on the %age of Ethanol involved, small amounts should not be significant, particularly for small shallow fires.
Again depending on the circumstances, you could get away with standard foams, but you would need more foam and a greater application rate to compensate for destruction of the foam blanket. Non aspirated spray AFFF is quite vulnerable as there isn't much of a foam blanket to start with, just a thin film.
There was a hoo-hah when unleaded first arrived about difficulties in extinguishing it with one brigade showing the media footage of tray fire tests they had done to show BCF and AFFF being ineffective, but it never became a real issue.
Real polar risks would be best served by aspirating branchpipe extinguishers (you can still get them!) using AFFF-AR or better FFFP-AR and considering dual agent with initial knockdown using high MAP ABC, Monnex or Purple K.
