Assign MSP-purchased iPhones to customer ABM

I work for an MSP that manages multiple Apple Business Manager environments for several customers.

I would like to purchase iPhones using an Apple account that belongs to our MSP company, but I also need to ensure that the purchased Apple devices can be assigned to our customers’ different Apple Business Manager accounts.

How can I acheive this?

As I understand it - If I buy an Apple device through the Apple Store with an administrator account from one of our customers' Apple Business Manager, then this device atutomatically gets added to the customers' Apple Business Manager solution.

The problem with this setup, is that when we purchase the Apple device with a customer admin-account, the purchase gets stored on the customer Apple Business Manager account, and not on our own Apple Business Manager account.

We would like to re-sell the Apple devices to our Customers, and that is why the purchase must be placed on our own account, but we should also have the opportunity to assign the purchased Apple device to a specific Apple Business Manager solution.

Is this possible somehow?