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@Howard
MegaExo and HT2 axles are both 24mm.
IIRC there are a couple of different MegaExo road BBs. I'm not sure what the difference was between them, but I suspect some earlier cranks had shorter axles than the later ones. So the width of the cups or plastic inserts may vary.
Whatves, a Tiagra HT2 BB is cheap as chips, so it wouldn't hurt to have a punt on one and try it out. Torque the crank bolt to spec and make sure there's no notching going on. If there's slop instead chuck some spacers in.