I understand you have limited space, in the far future, like if you get a different fridge.
Kegland sells the product that is called a hop bong, here's mine. I don't know if they came up with the name or not. After the valve you need a gas post and a prv. That allows the chamber to be flushed of oxygen. (I didn't know there was a sanke fitting like the one you ordered). I initially was going to build one with a sight glass as apache_brew has with a tee, but the tee would have been after the valve. The prv or the gas post could go on the top of the sight glass and one of those two off the tee. Apache_brew has the dual posts up top so CO2 can go in one post and O2 could be bled from the other post by depressing the poppet. The valve would be closed. That valve doesn't have to stay closed otherwise as the sight glass and remaining fittings should be sealed. I think it would be fine to take the tee out and put the sanke adapter on top of the sight glass. But then most of the time the valve would need to be open so that the prv is exposed to the headspace. Different ways to build stuff though and sometimes there are unknown reasons for specific combinations.
TheX2 uni has a prv valve built into the lid, it's behind the hop bong. The additional one on the hop bong is to flush the hop chamber. I also have a spunding valve from Spike. I can close the valve on the blowoff tube, remove the tube, and put the spunding valve there. That spunding valve has a prv too. The one however from Brewbuilt, shown below, is more illustrative as they use a cross in the setup. The left side has the fixed prv, and is in addition to the existing one on the lid. It's also $300 (it has the pressure gauge on it) ! I bought the Spike one normally $145 but I got it during black friday. I could have just used the one on my brew stand and bought a TC gas ball lock fitting but the Spike one is a little higher quality and a little more sanitary with the cup. Blichman has one for less money as does Brewhardware.
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hop bong, only $40 plus about $10 for the prv which is not included at Brewhardware. That's just a little more than a 1.5" sight glass. After which you need the rest of the parts. I was going to do it in stainless, I have a used sight glass but I went with the hop bong. Not as shiny but sort of "old school'. I can use the gas post on it to pressure transfer as well. I think it is a good, affordably priced design. The 2" holds more but my top ports are 1.5.
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