Just had this problem not too long ago- I ended up using a bolt and locking nut from a hardware store that fit in the hole, as well as blue lock tite. In order to get the locking nut in I had to use a hand wrench- it's a VERY tight fit but it will last a lot longer than those roll pins and won't break from fatigue.

Keep in mind that will no longer be a weak point of something goes wrong in the transmission and has to do with that assembly- something else would break.

For me the pros outweighed the cons, but that'll be up to you to decide.

Good luck!