At my last club, there was a stableford alternative on stroke days off different tees (which caused the occasional mind-slip). The big problem is that the comp. fee was the same, no possibility of getting a medal and the prizes were abysmal. (Although, they did get a 20m headstart for te common NTP and Super Pin comps.)
It also weakened the C grade medal field that net mid-70's may win the medal.
Personally, I'd restrict strokeplay to A grade and have the others play stableford.
Any objections? Work on your game and get into A grade.
Any further objections? Other grades are free to play stroke socially, outside competition times.