A power beyond valve should be able to go after the pump and before the OEM valve, but be careful that it is full flow and your piping is full flow.
The problem I see is with having very small flow with a crane, thus a valve with that large (open center) of flow does not usually have low end "feel" that (I like) for a crane. I have yet to see a valve with 30+ gpm flow and sections that would max out at 10-12 gpm. There should be some that have spools to handle that problem, but I have not found them.
After building a PTO and direct mount pump with similar flow to the OEM, and not having a winch or other high flow need, I'm probably going to have to go to a much smaller pump (front plow need about 10 gpm) because of the same issues.
How much flow does your Stellar hooklift need and does it have it's valving already?