I have staked/been staked for low stakes PLO I sent 30 buyins and told him to ask for more money if he needed it. I was prepared for 100buyin swings.
When i got staked i got sent 50buyins and told to drop down if had more than 20buyin downswing.
Both times we did 50/50 profit split.
I think it should take him 10weeks, he will surely play more than 3 tables? its impossible to get decent volume in playing any less than 6 imo. as you say 3/4 tabling is probably optimal, but itssss all about the hourly

I have 110k hands of 100plo on my database and raked $11k and change.