Been wracking my brains for something different. As others have said, the whole area is just awash with bronze age remains and I am sure your wife will already have a list of stone rows, standing stones, settlements, field systems etc she would particularly like to visit. What
particular aspect of the bronze age is your wife researching?[/color]
The most incredible recent discovery was the cist on Whitehorse hill and though the objects retrieved from the cist are not now on show ( I saw them when they were at Plymouth museum - truly incredible preservation and amazing for so many reasons) I really enjoyed walking up to the site where the cist has now been reinstated.
https://www.archaeology.co.uk/articles/cist-whitehorse-hill.htmWe walked directly from the end of the road which goes round Fernworthy reservoir (not the official carpark). It's a bleak walk so quite atmospheric though maybe not one for a really foul day.
We discovered our 'own' little cist (marked as a burial chamber on the OS SX725869) A lonely little monument not on a PRoW but the farmer happened to be there and was happy for us to walk across to it.
Re location for self catering, Moretonhampstead might be handy as being having easy access to the moor plus an excellent local butcher/deli, local organic green/grocer and good small co-op. I often stop off to shop there when travelling between Exeter and the moor.