TL

”Are you saying that “head over all things to the church” means that Jesus is “the source of everything wonderful to the church”? So rather than “all things” meaning “the world” it means “everything wonderful”(like salvation)? This would make sense, but it would mean “all things” under his feet at the beginning of the verse would be a different “all things” that he is head over at the end of the verse. Any comments?”
Craig, 368
”22 And He put all things under His feet, and gave Him to be head over all things to the church, 23 which is His body, the fullness of Him who fills all in all.”

In preceding verses (sentences) Paul does appear to be addressing Christ’s stand before the world. Remembering that verses and their ‘breaks’ were not in the original language, it seems that as you said, putting all things under His feet, is indeed different (and part of the preceding sentences) to Christ being head over all things to the church which is His body. Christ being the source, or preeminent over all things TO THE CHURCH is relevant as God’s special relationship with believers.