Green-dot
Install taller Main Landing Gears and position the MLG trunnions further outboard in the wing compared to present location. For example, a B757 MLG redesign with a two wheel assembly, instead of a four wheel bogie should solve the issue, fitting the wheels nicely into the unchanged fuselage wheel wells.
Reposition the LEAP engines to the correct location with a pylon redesign to restore aerodynamic stability, comparable to the earlier B737 generations.
Remove MCAS software all together.
Then for
PR reasons, if so desired, change MAX into MIX . . . . .
Well, just the first bit would have cost a reported $Bazillion* to redesign the centre fuselage/wheel bay. My guess is, that's why they didn't do it.
Reposition the LEAP engines? Hmmm, very powerful engines and now with the original leverage arm giving a greater nose up pitch upon application of high power. Perhaps some software could be written that . . .
*Thinking about the figure. The R&N post told of a very high figure which I now tend to disbelieve. But there's no doubt it would have been a serious chunk of change. Very small change in hindsight.