This is something I've been curious about for a while now. I've contacted some surgeons, and they never say much more that the cost benefit isn't worth it. But I've had two friends who've both had surgery recently and one had far less swelling after, and she had a orchi, and the other had major swelling, more than usual. But in any case, it would make sense to me in the recovery process that having an orchi before srs would help, as there would be two less body parts being removed, but I can never find any proof.
Now I have my consult with Mcginn coming up in Nov and should have a surgery date for about May/June, but if I can have less swelling after surgery I would totally for for an orchi in the meantime, as I havn't even been on a T blocker in over a year due to other medical reasons.