At this moment only acceptable structure for you, is to give to other people big seller discounts, if they could do large volume sells.

All other models are not viable for you at this time at this market, because you are too weak to struggle.

If you will accept other company to access your internal data, it will be very easy for them to just copy all you do, and then say "you don't need anymore, we could do all this stuff without you".

Even if you technically could copyright your stuff, they will learn how you done it and could very fast repeat all parts as clean room.