The bogies can be made pretty reasonable by chopping up the plastic henglong ones. Yes they wont be perfect, but they will look good enough for what is available.
As for the track pads, I plan on trying to make flat track pads with a 3d printer. It would require buying a Mato metal track upgrade kit and disassembling the whole thing and changing the pads out. A big job in itself.
That would give the M3 the correct look. Yes the track would be a tad to wide, but what else are we gonna do.