In fact, a cursory search of the Oxford English Dictionary found no examples of be-prefixed -ed adjectives based on modified nominal bases, suggesting that be-could not form verbs with modified nominals even when it was most productive in its history.
i conclude that, even though the phonologically null version of the verbalizing prefix be-might attach to a bare nominal base and feed the formation of -ed adjectives as adjectival passives, this analysis cannot be extended into covering cases involving modified nominal bases.