There is a lot of confusion about reshipping. All Chinese vendors worth their salt do this. It's a requirement for me if I'm buying large amounts of anything. If you choose to not prioritize this service, you will have very few large sales, especially from vendors. Which I'm sure you want the business of.
I think you should talk to your partners and figure this out.
I think you're not understanding the importance of this service. No matter what I order and in what quantities, I should be able to choose reship if I want to pay extra for that service.
Look at qsc, even dragon offered this. Which are/were two of the largest raw suppliers on mesorx.