1 1/8 threaded headset advice

Yes...thats a different version. That's the V2. Not as good and your right a bit more plasticky!

Have you considered tange....used those too with no issues.

Low stack too.

Would the stack height of this be too much?
Yes in theory you will be short of thread on the forks....as thats a 38mm stack. Your ritchey is 35 ish.

It does depend on how hacked the forks are.....ie pull out the stem and see how much is left between the top of the forks and the top of the locknut thread. You might get away with it if there's no space!
Stack is closer. I would still pull the stem out and take a look to see how much you have...also check for that washer.....