There's certainly a lot of cool devices out there but as you say 275 is some serious change. Perhaps you build your own. I bought a sight glass from Amazon, 1.5" TC though but it was around 25 bucks. Not sure what's out there for the top part but I think a TC cap with a 1/2" pipe thread with a tee, PRV and a QD would do the trick. Just some thoughts for a DIY project and save some cash.@RyPA
In another post: Fermenting under pressure
"I've decided to purchase another Inkbird WiFi ITC-308 Digital Temperature Controller Thermostat Remote Monitoring Controlling Home Brewing Fermentation Breeding Incubation Greenhouse: Amazon.com: Industrial & Scientific to use with Amazon.com: iPower GLHTMTLX2 2-Pack Durable Waterproof Seedling Heat Mat 48" x 20" Warm Hydroponic Plant Germination Starting Pad, Black : Everything Else and stick the fermenter inside a small refrigerator I'll take my bottled beer out of and stick it in there. I don't want issues so this should be perfect, at least I hope so."
So I think I have the equipment side covered now except for the dry hopping without opening the keg part. I'll get some magnets and try that next time maybe. I've also been drooling over: The Dry Hopper from Brewers Hardware nad it sure is pretty but I can't justify the price. LOL