Erocksmash, carelesslove, here !
If I remember correctly, we've done some S&W parts swapping / selling, before !
By all means - get that 25-2 ! Don't sweat the rust, as none of us are perfect anyways!
I have a relatively rust-free 25-2, and I shoot that thang ! You can save yourself a lot of effort (not to mention the bullets, powder, and primers) by measuring your cylinder throats. Mine are a uniform 0.4555" - way too big for lead bullet accuracy, with 0.451" bullets. Hardball, or jacketed bullets still shoot OK.
If tack-driving accuracy is required, get yourself some 0.454", or larger lead bullets and tight groups can be easily achieved ! Send me a PM, if you are interested, and I'll give you my recipe !
I also have a very old TripleLock, with a barrel & cylinder that are as rough as a cob", from rust - but, it still shoots very well, when the bullets are sized to fit the throats.
Good luck - let us know how the project goes !
Tom "carelesslove" Love