Basically have already lived this dream with Haxe. However the cross-platform tooling side of Haxe has historically been the fly in the ointment since it sits a

Basically have already lived this dream with Haxe. However the cross-platform tooling side of Haxe has historically been the fly in the ointment since it sits above the "real runtime" of whatever you targeted, creating all sorts of bits of friction. And it doesn't cross over into "systems" stuff - it's always within a GC'd environment.