IPAM For Networks Reusing Same IP Space?

I manage multiple networks, some that just happen to share the same IP space. The current workaround is to assign those sites to a VRF in netbox, so those IP blocks don't get associated with each other. In reality, all the sites are in the default VRF. Well we are taking on a few more sites to manage and as luck would have it, they have VRFs.

While I can continue to make this work, I'd like to look into possible solutions to limit any conflict and confusion down the road.

Looking for suggestions to solve this issue without having to standup multiple netbox instances.