My rear ACE actuator is leaking. Maybe a cup of fluid overnight. I dont know how quickly I can replace it with one off a parts car or fix the seal. Is there a way to disable it receiving pressure or actuating so it won't continue leaking for the time being? Also, would it be too risky trying PS stop leak types of fluids?

 

Just get a non-ACE belt and bypass the pump. Takes a few minutes and easy. Nothing to change or modify. The yellow light will be on for the ACE, but the truck will still handle fine. The system will be in "locked bars" or something like that. I had to do that on my truck and it is fine, but do expect the handling to be a bit different.
As far as fluid, I can't remember what I had used, but I think it was the PS fluid with the stop leak in it (but it really doesn't stop leaks anyway).

 

And or pull the fuse.
Stop leak won't stop a ram from leaking and I don't believe there are any rebuild kits.
Once you get it back together you will need to find a shop that has a scanner capable of re-filling/priming the system