Looking for alternative mix ideas for cape sundews

what are alternatives to 50/50 peat perlite mixes? I have the suspicion my sundews don't like much the peat i can use, i was wondering if a full inert soil could be good, i have a ton of pumice to use. Or, if the organic base Is mandatory, if i could go with a mix of pumice and sphagnum moss, or anything like that. I usually use perlite but it's always a mess, that's why i say pumice, floats a lot less, but i'm unsure about it's effects on sundew roots. Appreciate the help