(1) Maybe ride mix of some grvel and road interspersed with pavement instead of 60+K of all gravel? Most of us ride Gravel for the better scenery and to get away from lots of cars, not to justify buying a gravel bike.
(2) Maybe some different equipment could help. I am in my 60s so have lots of aces and paind and limited flexibility. I ride a Lauf suspension front fork, a Redshift suspension seatpost and a Selle An Atomica seat. With this setup I have no hand numbness anymore, and essentially zero problens on regular 40+K gravel rides, so maybe some new equipment might improve your comfort. Rockshocks also just came out wit a suspension fork for a gravel bikes.