The PES G4 supercharger is probably the best bet, if you can find one.
The issue with heat is because while the D2 engine bay is a little longer than the smaller models, it actually has less space around the engine than the C5 or even the B5, because the aluminium superstructure is much bulkier than the steel of the lesser models. That means less airflow around the engine, and any radiant heat source is closer to everything else.
Martin had problems with everything cooking in the RS8 simply because it was all in such a tight space. It caught fire at one point because the radiant heat from the turbochargers melted one of the cylinder head seals which then dripped oil on to a very hot exhaust manifold, so he has extra heat shielding everywhere.
Also the structure of the chassis legs and wing supports makes it tricky to get intercoolers in the traditional side-mount location so air-to-water cooling a supercharger like the PES setup is probably the best solution tbh as there is plenty of room in front of the radiator lower down for a charge cooler radiator. You'd be hard pushed to get a decent intercooler in there as the front grille is quite tight to the top of the radiator, although if you forfeit aircon that would make some more room.
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