One other idea which came to mind, is that I can't help but to wonder that if, you purposefully had the forward crossbeam designed to have a bit longer than normal chord, from front to back. Could it be built so that you could have a standard headstay, & a detachable Solent stay. From a structural stand point I mean, in terms of the crossbeam being able to handle loads such as that.
Though, also, there are catamaran
designs which don't have a traditional forward crossbeam per say. But rather, they have a long beam (prod) extending forward from the mast beam/cabin house structure, out to about the boat's bows. From which all headsails are flown.
Think of it as an EXTRA Long sprit or sport boat asymmetric
kite pole extending out from the beam structure which supports the mast. I would imagine that it be fairly easy to adapt one of these designs to handle a staysail. Given that the prod can handle the loads of the headstay & any sails flown from it, in addition to say, the loads of a kite, when one's being flown on such a boat.
Ah, & BTW, the other day I forgot to mention that my Tri was a Searunner
. And to the best of my knowledge, all of them are cutter rigged. Or at least from the 31'er & up.