The team has tried twice to acquire Manumaleuna, and failed twice. He's more the kind of TE that Fox wants (big blocker, occasional receiver).
A 2 headed hybrid along the lines of the Brandon Manumaleuna, Antonio Gates combo the Chargers use would be optimal. Obviously we won't find an Antonio Gates quality receiver but adding a passing situation TE to the roster might be an option.
On that front, there's also Jim Kleinsasser. He's a little older but has always been one of the better blocking TEs (and an occasional fullback). If we stick with the ideal Fox type TE then he'd be a free agent option.