Your comment about recreating the "Spearhead" moment of the TARDIS arrival and the 3rd Doctor falling out got me thinking.  If you had a spare 2nd and 3rd Doctor CO figures you could put 3's head on 2's body and get Pertwee wearing Troughton's clothes.  Although from "The Three Doctors" it's plain that 2 is appreciably shorter than 3, the newly-regenerated 3 would would look silly if the CO figures weren't actually the same height, But, probably thanks to CO's cutting corners in the sculpt, they are. So it would actually work.

Ha ha! Someone's actually done it!

https://www.ebay.co.uk/itm/CUSTOM-DOCTOR-WHO-REGENERATED-THIRD-DOCTOR-IN-SECOND-DOCTOR-OUTFIT-5-INCH-FIGURE/153405357087?hash=item23b7abfc1f:g:DLoAAOSwndBcgBdw