Proto-Germanic reflex
*pótis has a Germanic descendant, *fadiz, so it's likely that that part of the compound would have remained recognisable. Seen as separate words, the two would have ended up as *timiz fadiz, assuming that the first word would have remained a consonant stem (which is somewhat unlikely). It's more likely, perhaps, that it had become a kind of cranberry morpheme attached to the still-recognisable second word, giving something like *timfadiz. That might have survived into Old English as *tīfede, giving modern *tived /ˈtaɪv(ə)d/. Alternatively, the first part might have been reanalysed as a vowel stem, giving *temafadiz or temufadiz. Either of those might have given the same outcome in Old English, but I don't know if the nasal spirant law would apply to a syncopated vowel in this way. In Old High German, the result would be *zimfat, modern *zimft or similar. In Old Norse, the result would be *timfaðr.