Bingo! Just what I was going to suggest. Finding a place to put the thing might be a problem.

Frankly, I don't think it will need it.

A good starting point for the low speed circuit on an airbleed carb is to put the screw in a position so that it fills 1/2 the available hole. It's hard to go wrong using that as a starting point.

Please report back with your results. Keep in mind that we are all beginners with this engine, or at least most of us.

Hey now there's a new invention. A plug that changes it's heat range based on rpm. Very clever. Actually heat range is determined by the amount of metal in the plug that transfers heat to the cylinder head and rpm will not change the heat range. Nothing will. A hot plug is a hot plug and a cold plug is a cold plug. That's physics.