Well, I did a little more research and figured out that the Blackhawk in question has a fixed front sight, not one of the pinned ones that's more easily removed. So, I guess we can disregard this question.
Why? Just get a gunsmith involved. This is something that should be really easy for a smith to handle and inexpensive as well.
The thing is, the revolvers in question are my late granddads, and I just don?t know how to feel about doing major alterations. That?s why I put a no drill Weigand on the 41.
Formerly TN Lone Wolf
"We are only as strong as we are united, as weak as we are divided." - J.K. Rowling
Bowen Classic Arms Rear Adjustable Target sight is what I use on my two Smith and Wesson X-frame revolvers. A gunsmith is like a doctor. Sometimes necessary for issues that come up. I would recommend you find a good gunsmith to speak to about your goals first. Then see what develops.
Weigand also makes a number of no drill, no tap bases, but I never mentioned them as he was asking for an aftermarket replacement sight option. However, this would solve the desire not to modify anything.