Lanefan
Victoria Rules
You just have to track by initiative instead of turn for those effects - instead of "at the end of your next turn" the effect ends on the same initiative next round as it started in this one, regardless of whose turn goes when next round.I play a lot of Savage Worlds too and the changing initiative does add to the tension and (good) chaos of the fight. I really should give variable initiative in 5e a try and see if it works well. My one worry is that it will play hell with "until turn" effects.
Yes this means sometimes the target will be affected twice and other times not at all, depending how the init rolls go, but that's part of the chaos.
