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Can you get flatmount to postmount adapters?
No but you can the other way round ..
Enve GRD is also post mount.
You could do what @xDOMx did with his field, get the frame ready for flat mount, get some forks that are easy to buy at the moment like the TRP or something, buy a front post mount caliper and keep the flat mount caliper when the forks are widely available.
Its a catch up game for everyone.
Can you get flatmount to postmount adapters? This disc brake business is a whole new world of WTF for me.
The Enve GRD fork fits the bill, but dealing with Saddleback is proving more challenging than normal at the moment. And its expensive, even at trade.