If they are going for the aero fix, which I still doubt, then the easiest solution is to
1. reduce the efficiency of the vane on the nacelle, which will give a nose down trim at high AOA, but a commensurate degradation of the Vs1g.... it is a pretty fix, but not optimal, just doable.
2. add VGs to the outer wing area, probably outboard of the ailerons, which would tip load slightly, and changes the total bending moment on the wing slightly. It would potentially alter the CG envelope slightly, but it would be improved for aft CG's, and slightly more restrictive for the fwd case.
3. add a wedge to the aft underside of the outer wing, outboard of the aileron. An elegant solution. same effects, just without the barbed wire on the wing.
4. adding additional fences etc (vortilons are the reduction of a fence to the minimum profile) would also achieve a similar outcome, but have a drag count and are ugly.
5. another odd vortex device located behind the slat could be set to alter lift rather than only drag,
lots of choices...
The trim wheel is another issue to be dealt with if the industry considers it important to sort out. Sorting MCAS reduces the issue to manageable levels, but it is still something that needs training to cover the ANU case.
however, the fastest way forward is likely to be to sort out the MCAS architecture. Doing the aero mods would require a fair bit of validation flight testing, most of that would not come from CFD modelling.