I wish I understood why SE seems to be so against adding access to gardening, chocobo stables, and airships to people without houses. If they want to keep the ward system, it's the only way to keep things fair - essentially make it so that having a house is only for QoL/prestige.

Put a public stable in Bentbranch, airship hangar in Mor Dhona (or next to your squadron door) and greenhouse...somewhere. For aiships and greenhouses, maybe pay a fee to use them. This is a very elegant solution to the biggest problem with limited housing (content that you can't access because you don't have a house), it's been suggested hundreds of times, but they just won't do it.