I've been reading many questions here about radicals, and it seems there is some confusion over them. My question is:
Apart from the 214 radicals of Kangxi, what are the other components/elements/primitives which are contained in kanji from the Joyo kanji list but not listed as 'official radicals' in the 214? In other words, I am looking for a list of sub-elements which are not considered radicals (according to Kangxi) but do appear in some kanji on the Joyo kanji list. I'm sure there are quite a few, but how are they categorized? I'm trying to make two lists, comprising (a) 'official' radicals, and (b) all other components which appear in joyo kanji but not in list (a).
To give an example, take the sub-element ⺤ which is part of kanji like 受、妥、採, etc. As far as I know, this is not on the list of 214 kangxi radicals, but does appear in several joyo kanji. Therefore, it will be on my list (b). Does anyone know of a complete list of other such elements?