Killer deals at Beefcake Racing! I've bought so many wheels from Terry that they wouldn't fit in the bed of my truck. Which I coincidentally just bought a set of beadlocks for. LOL
I went from J&M to Cortex. The Cortex units are superior!
https://www.mustang6g.com/forums/threads/16-gt-sleeved-predator-and-f1a94.143471/post-3771779
Sounds like you are just making quick 1 or 2 gear pulls with plenty of time to cool down between. That's really nothing IMO. Not to say that water cooled gates wouldn't benefit you. Gates will last longer and perform better in that duration. But it's up to you if that cost is worth the benefit...
You already acknowledged the purpose of coolant flow thru a wastegate. It's a mechanical device utilizing a rubber/nomex or whatever diaphragm on a glowing red hot exhaust pipe. Engine coolant temp can be potentially 1000deg cooler that the exhaust gas. Your application likely does not require...
The compressors appear similar, that's where the similarities end. Not nitpicking anything. You are simply taking the one similar detail and extrapolating it. Centri is not like a turbo.