The problem with Metol and Sulfite (or probably any alkali) is not that the latter causes the former to precipitate out. It doesn't and there are plenty of working developer formulas loaded with Metol and operating at high pH. The issue seems to be that Metol crystals are slow to dissolve when the solution is already alkaline.

And I really don't think Kodak's solution is as simple as writing in the manual to use hot water to mix D-76. Note Kodak holds patents for encapsulating compounds to make them go into solution later than they would do normally, and this gives them the option to dissolve different compounds in one powder in a preset sequence.