Lord H sounds like he has a fighting spirit and, like all rabbits, lives very much in the moment. Seizure past, he concentrates on the important things in life - like breakfast!!!!
You have an amazing relationship with C and you know your bunnies. As you both (and other specialists) feel that additional diagnostics would not be in Lord H's best interests then that sounds like a perfectly good reason not to investigate further.
Topping up the vibes for you both this morning xxx