How to Add a 2nd PayPal Account for Donations

Question:
I’m supporting a school booster that sells merchandise and accepts payments through PayPal. That account incurs the Wix fees and PayPal fees. They would like to also accept donations through a 2nd PayPal account, Charitable Giving Fund which incurs 0 fees. I can easily create a link, but he requirements specify a form allowing the user to upload files and fill out information before paying the donation fee. How can I accomplish this?

Product:
Wix Donations, Wix Forms

What are you trying to achieve:
I have a store tied to a PayPal account for payment. What I need is a 2nd account tied to ZERO fees for donations through a Wix form, either using the forms app or donations app. We have sponsors that need to fill out and form and upload files before paying. Their sponsorship should incur ZERO fees because it’s a charity

What have you already tried:
I have tried creating a Wix form and Wix donation app form. They all default to the payments in the account. I have tried embedding code in the site which isn’t helpful because all the information leaves the Wix site. My only option is a 2 step process to allow users to upload files and form information, then direct them to start donate using an external link. This workflow is broken because there’s no way to know if the 2nd transaction is related to the 1st.

I have also tried looking into 3rd party plugins. I haven’t found one yet that integrates with PayPal Charitable Giving

Additional information:
I’m open to options that don’t involve writing code through Velo, since the system will have to be maintained by another school volunteer