I like the .38 super which can easily match the .357 and the 9x23 which can come real close to the .41mag.
They are easy shooters and I can reload for them if I choose + I have about a thousand ronds of each on hand.
In actuality and all honesty there is no legit reason except I think it would be neat, cool and otherwise fun. It is just a project to make life not so mundane.
I really don't know much about the 9x25 except it pushes the 10mm pretty good for performance.
I am going to venture--just from reading--that a 586 or a 28 will be the choice. I am thinking the 586 is my choice for now---they are fairly easy to find, matter of fact i have one--but I may try and find one that is not so well kept. it is going to be smithed to begin with and the blueing will certainly have to be redone.
There is also the outside chance that I might send it to S&W for some art work and reblueing.
I am going to call S&W tomorrow to see if they will do all of the work---if so, then it might be a new one----but I really doubt it. I know where I can get a near pristine 586 right now for $600.
See this is part of the fun--figgering out a project and making it work.
A .357/.38 & 9mm are just about a 1000th apart. I shoot 9mm slugs in my .38super reloads and have no problem.
Blessings