I used to carry a large SA revolver concealed. I do not think it gives nearly so much a disadvantage in fighting as some people suppose it does. However, there is one aspect I would suggest reconsidering and that is the very light single-action trigger once the gun is cocked. We have all heard the advice not to cock a double-action revolver for defensive use. If we understand the pitfalls of startle-response, sympathetic grasp reflex, contralateral contraction and trigger affirmation, we should be wary of very short and light triggers. While the uncocked SA revolver with a transfer-bar is comparatively "safe" with respect to unintentional discharges due to drops, snags, clothing or fingers in the trigger-guard, it is not "safe" at all once the hammer is cocked -- at least not from trigger hazards, it would be safe from drops. A single-action without a transfer bar is an unreasonable risk to carry concealed. With an empty-chamber, and an appropriate open-carry holster and due care, it could be fine. If a jacket flap goes over it, fine, but at some point you're stacking too many cards against yourself.
People will fault the SA for unreasonable faults. On a shot timer, it is practically the same time from the holster to the first shot. For me, that's somewhere around 1.5 +/- 0.2 seconds. Cocking happens when the hands come together at step 3 and finishes at the end of the push-out, step 4. It can also be done one-handed with a little cost in speed. Splits with support-hand thumb-cocking are a little slower than with a double-action, but still about a 1/3rd of a second which is about as fast as we can think. People can dump magazines into a target faster than that, but in a defensive scenario we should not be shooting faster than we can think or continuing to fire when the threat has ceased. Research (Force Science Institute) has shown that it takes about 0.25 to 0.33 seconds to make a decision to start or stop shooting. Besides, how likely is it that 0.1 faster splits will make any difference in a defensive shooting? Reloads are slow, but there's little evidence they ever happen in civilian personal protection incidents. They are certainly not likely. The capacity is low, but I would be more concerned about making first-shot hits than 15th-shot hits -- it will certainly make a bigger difference.
So the real concern for me with the SA is the high probability that we will be in a situation that requires we do not shoot or do not shoot again. This situation is in the "most likely" category as opposed to the need for super-fast splits, high-capacity, and fast reloads which are in the "worst case" or extreme outlier category. The need to "not shoot" is imminent in any lethal-force situation. If the hammer is cocked as we will want it to be if we do have to shoot, then we have made things dangerous for ourselves. Of course, we train to keep the finger off the trigger and outside the trigger guard until we're ready to shoot, but research has shown that even highly-trained people fail to do so without even being conscious of it, especially under extreme stress.