No need to overpay for a No. 3 receiver, IMO. I also don't think Johnson is dropping, it's just not a high-priority position for NFL teams. Just looking at premium positions, here's everyone I'd expect to go before a center:
QBs: Caleb Williams, Drake Maye, Jayden Daniels, JJ McCarthy
WRs: Marvin Harrison Jr., Malik Nabers, Rome Odunze
OTs: Joe Alt, Olumuyiwa Fashanu, Taliese Fuaga, Troy Fautanu, JC Latham, Amarius Mims
EDGE: Jared Verse, Dallas Turner, Laiatu Latu
IDL: Byron Murphy, Jer'Zhan Newton
CB: Quinyon Mitchell, Terrion Arnold, Nate Wiggins, Cooper DeJean, Kool-Aid McKinstry
Not a premium position, but you can include Brock Bowers in the mix as well since he's a special talent at TE.
Obviously it won't necessarily go down that way, but at best you're looking at No. 25 for the top center if only the premium positions go first.