A friend of mine - will try to make a low weavertype-base with a rear sighth for my FA 454, 7,5" - so I can change from scope to fibersights within seconds.
If he succeed - this will be my pri 1 gun.
No 2 - will be my 629, 4" - with similar system - if he succeed

With a Weaver-system, I can easily choose between a scope or a Docter-sight.
Then all my other huntingrevolvers can be sold - or be forgotten in the gunsafe

.
Concerning SA/DA:
For me - it doesn`t matter.
I have to find the target anyway - and I will do that with a SA as fast as I do with a DA.
When I shot my only

buffalo in Zimbabwe - all 5 shots was done within few seconds (Doctersight).
Even that the first shot was a heartshot - I continued to shoot at the dagga-bull, until my FA was empty.
I`m sure that I would not shoot faster with a DA.