If it's of any help ...
Following prostatectomy 2 years ago I was fitted with a penile prosthesis to deal with ED. (And it certainly does - but that's another story.) The additional plumbing made the use of normal saddles - Brookes, Specialized - from uncomfortable to impossible. An ISM PN1.1 saddle has been just the thing for the road bike: many thousands of pain-free miles since getting it.
I imagine that whether it would be right for you may depend on how deep your tear is. The ISM takes all the pressure off everything from the scrotum forward. If the tear is in the area behind the scrotum and before the urethra reenters the body it may not be the answer.
Good luck!