h2o's Ti audax/gravel/bikepacking bike

This titanium list is off the top of my head (as you can see I've been thinking about this too much!)

UK-based titanium brands

1. Albannach (unknown but probably overseas, custom)
   
2. Burls (made in Russia, custom)
   
3. Enigma (made in UK and Asia, custom & OTP)
   
4. Kinesis (made in Asia, OTP)
   
5. IRIS (unknown but probably overseas, OTP?)
   
6. J.Laverack (made in Asian, custom & OTP)
   
7. Mason (made in Italy, OTP)
   
8. Planet X (made in Asia, OTP)
   
9. Pretorius (made in Asia, custom & OTP)
   
10. Reilly (titanium frames manufactured overseas, probably in the same place as Enigma, custom & OTP)
    
11. Sabbath (unknown but almost certainly overseas, OTP)
    
12. Sonder/Alpkit (OTP)
    
13. Spa (unknown but almost certainly overseas, OTP)
    
14. Ted James Design (built by the man himself in the UK, custom)
    
    

If you're looking at Russia, Triton would be the best candidate and build quality wise, would appear to be pretty damn good.

The "middle-ground" would probably be Burls, the Kinesis GF Ti Disc (might not have clearance for your requirements), Enigma (the Escape), J. Laverack JACK (clearance an issue again) and maybe a Reilly Gradient (but I can't find much anecdotal feedback or reviews).

In the end I counter-productively picked a carbon bike (an Open U.P.) but I'll circle back to Ti.