Solid Hardwood, Engineered and Laminate Flooring - Best way to level subfloor ?.

My house was built in 1980. After I removed the carpet to install laminate flooring in the hallway in the first floor. I noticed a drop by one 1’’ over an area of 8x10 ft’. Edges of the joists under that area were previously subjected to termite damage. Last summer I got a contractor who removed the damaged terminals of the joists, terminated the shortened joists to a new 2x10 beam and then connected the beam with the double top plate and the outside wall using a set of short new joists. No jacking of the old joists to compensate for the floor drop was done. The ceiling of the lower floor is finished with no easy accesses the joists from below. I have a ¾ inch plywood sub floor.

I am trying to find out the cleanest way to have that sub floor leveled for laminate flooring.

1) Is it better to remove the sub floor and then sister the sagging joists with some straight “levled” 2x4’s. Cut the subfloor around the walls and then relay the sub floor back on top of the leveled 2x4’.

or
2) build up the unleveled are with roof shingles and then cover the are with ½ underlayment.
or
3) use floor leveling compounds. And then put ½ inch underlayment.


Thanks

Sam