@EireDiver606 @REVAN 's comment is not always true
tank being used carries 13lbs of gas that has to be compensated for. A 7/5mm wetsuit will have somewhere around 12 ish lbs of positive buoyancy depending on the size of the wetsuit.
25lbs that has to be compensated for, and a 30lb wing doesn't leave much extra lift if you have to get higher out of the water if it's really choppy. I'd be OK with 30lbs if I didn't have anything else on the rig i.e. pony bottle, camera rig, etc. and was diving in relatively flat water regularly or had a really big safety sausage and/or 50lb lift bag that I could use for supplemental buoyancy at the surface. I use marginally sized wings cave diving all the time, but they don't have to hold me at the surface.
If the diver is very positively buoyant, then a 30lb wing would not be able to hold the rig at the surface if it was removed and all of the lead was on the rig as was mentioned in the OP.
Me personally in that situation? DSS LCD40 or Torus 35, with a SSfar plate and the weight plates. If I had to dive like that now, I would use my LCD30 wing with no issues, but would carry a lift bag as well as my big safety sausage for surface assistance in rough water, but wouldn't recommend a new diver cut it that close