Yes, fitting an A12 distributor into an A12 is the easiest solution.

To get the most HP out of your A12, the distributor should be recurved. Which is a lot of work or a lot of expense or both. Using a programmable crank trigger ignition is perhaps the easiest way to do it, about the same cost as thorough recurve and you get to do it yourself.

And fitting the crank trigger wheel is easy ... unless you do it a difficult way. For some reason most choose the most difficult methods.