By no means would I believe EOS SHs would all be YC3 lvl and above...
The more likely scenario is mid trio would be comparable Peros. Daifuku and Oven so high mid tiers to low high tiers while Nami and Chopper would be mid tiers comparable to Barto and Cavendish tho prob a bit weaker.
I think it makes sense. SH will fight BB Pirates.
Usopp vs Van Augur (sniper vs sniper)
Nami vs Lafite (navigator vs navigator)
Chopper vs Doc Q (doctor vs doctor)
Imo Van Augur, Lafite, Doc Q are YC4. Those 3 are 1 of EOS antagonists of the series after all so weak trio bounty might be above 500 million EOS.
As for mid trio
Franky vs Sanjuan Wolf (shipwright vs colossal battleship)
Nico Robin vs Catarina Devon (most dangerous woman vs most dangerous woman)
Brook vs Vasco Shot (I get this idea from alpha2late video)
Sanjuan Wolf, Catarina and Vasco are Impel Down prisoner level 6 and they were grouped with people like Jinbei, Ace, Crocodile and imo all of them were YC3 or above.
So it's possible for mid trio bounty to be above 800 million.