Yeah, I'd play basically ACBL multi-defense 1 + leb so X is TO of spades, 2♥ is TO of hearts, and 2♠+ is leb. Pass and then X is penalty. Losing the ability to bid a natural 2H seems like a HUGE loss. I prefer X is values, 2H/2S nat, 2N inv+ with clubs or to play in 3D, 3C inv+ diamonds, 3D inv+ hearts, 3H inv+ spades, 3S minors. So if you have a stayman hand you start with double and then you're in a forcing pass so can sort it out pretty easily.