To make things easy and to stop all this they simply should not put a up any candidates when they don't have the required numbers as a coalition. It will augur well with their stance on the EFF. Saying they are not interested in working with the EFF but putting up candidates secretly hoping for the EFF to vote for them sounds slightly hypocritical.
IMO they're kind of between a rock and a hard place.
Either they don't form a coalition when they have the chance (minority or majority) and get scolded by everyone.
Or they do form one but rely on EFF in some way with the chance of EFF throwing them to the wolves, and getting berated by everyone when it eventually collapses.
Or forming a coalition involving EFF will not sit well with either EFF or DA voters or ASA voters (presumably), and getting berated by everyone.
Honestly, the only muni the UF will hold in GP will be TSH in that case and of course Midvaal but that's not a coalition.
So either way. they'll get scolded for some reason.