Dave Lanara in Ohio might be willing to take on a project like that.
He specializes in Colt SAA,, but generally from the restoration angle.
He'd most definetely be able to refit & restore the action to original specs including welding and recutting the hammer notches to new if needed.
All expensive work but that has to be done before any refinish/ restoration or upgradeing fancy stuff is considered.

The grips look like standard Bisley. The #5 IIRC used a Bisley backstrap and a SAA front strap. Some fitting is done to join them smoothly. Standard Bisley grips won't fit the #5 because of the marriage of different model parts and they are a custom grip venture.

Dave usually has quite a stock of various parts for restoration and repair. But again,I do not know if he would take on a custom upgrade as proposed beyond the repair/rebuilding of the revolver as it is.
Give him a call and see what he says.
If he doesn't want to take on the job,perhaps he can refer you to someone else he trusts.

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That (King) SAA Conversion pictured is interesting as it has a shouldered bbl w/step-down radius to it. Looks like Colt/Hartford markings on the side.
Might be a (late) New Service bbl as they are the same thread as the SAA,,just the shank is a bit different length but easily fitted.
The grip looks a bit thinner through the middle than the regular Colt SAA. Some of the repro 1960's imports from W.Germany had that look (Dakota,Liberty) and the longer 1860 grip.

I think the very few handful of original 22rf cal Colt SAA revolvers built were made with the 1860 size grip frame. Probably some others. But I don't recall them as being so thin through the waist as the gun pictured.

It also looks perhaps to have a Ruger style trigger spring behind the trigger inside the guard,,Small coil spring and plunger.
** Looks more like a simple trigger stop pin from the pictures in the link posted below
Could be all pieces of 'King's' work I'd guess.