I forgot to come back and update - after dealing with gimbal issues and motor pod failure!
I swapped out my rear stock antenna on Solo when I swapped the wifi card and I replaced the antenna with an SMA-u.fl pigtail which I ran through the the leg hole that normally passes the stock antenna.
I mounted the SMA connector in the gap between the ridges of Solo's leg, using some adhesive backed foam tape and some zap straps.
Not the most elegant, but I don't like the idea of drilling through Solo's shell. I toyed with a metal pipe clamp but didn't want metal wrapped around the antenna. It's quite solid - I can unscrew and screw on antennas without moving the assembly. I use a strip of Velcro wrap around the joint assembly just to be sure the antenna is tethered to the bird. It also covers up the zap strap ends a little.
Eventually I'll make a 3D printed mount; I think that I can screw into one of the Solo leg screws, with a loner screw of course.
Now I can swap antennas at will. I've actually reused my extra Solo controller antenna on Solo as well when running all linear (since I use the Alfa patch on the controller). The stock controller antenna is actually quite good.
With my testing, I found the mad mushroom to be a better antenna for Solo than the clover when using circular polarized antennas like the Pepperbox.
Ironically, the ImmersionRC RHCP patch must not be as well circularized as it works better in combination with the Solo linear antenna vs the clover or mad mushroom.
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Would also like to hear more about how this mod works. I have a pair of those 2.4ghz commercials antennas sitting on my work bench from my last bird.