My two cents, and reiterating that I haven't received the bike yet, but I must say that they (Yo, from Dean) are being fantastic in the preliminary discussions...really great communication and service and overall great guy
If you don't want to go with Dean or Merlin, Carver does an allroad frame which looks nice, or VanNicholas maybe? or these guys I found while checking other options
Terlingua Titanium Gravel / All Road 700c / 650b Plus — Titanium & Steel Gravel, Mountain & All Road Bikes | Chumba
No idea whether they're good or not though