attached is a spreadsheet that will calculate the house edge for any deck subset. Just enter the quantity of each card in the upper-left blue squares (one cell for each rank/suit combination). It will show you what the new player edge is and what the hilo count is. You can also change the payouts in the yellow section for different versions of the bet. I made a sheet for both version from the wizard’s website so that should cover most of the bases.
I agree that this is a great side bet with payout version 1. It gets positive very often but the variance is pretty high. Depending on your bankroll and the betting limits you might end up making this bet around 20-30% of the time with an hourly ev of close to 1 unit.
-sonny-