The "simple stratum protocol" lacks a lots of simple features for basic share spoofing / exploit protection so it's a lot of more work todo on my side for validating shares, duplicates, difficulty etc which makes it rather a big risk instead of an advantage if implemented, but I guess if it takes another 1-2 weeks I'll have a look at it again..
I agree, if you don't support HTTP for Sia, proably it will take you more time to implement my stratum. But if you support HTTP it will be very easy because my stratum is just a wrapper around HTTP.