I've made a suggestion in the past to let FCs be able to rent/buy a workshop at the grand company of their FC's alliance before, sadly didn't get anywhere.

Even if it was just a simple 'pay once and unlock' thing for FCs, it'd let a lot more people access those things, could even have an upgrade slot in them for smaller FCs to be able to charge up rank 3 actions on an Aetherial Wheel with the furniture item if they could craft/buy it.