Wordpress plugin takes me to custom pledge, not my own tier

Hello dear community!

We have a problem with our Patreon WordPress integration.

We direct our users to our website, where, after clicking on the Patreon checkout button, they are supposed to be directed to our €7 tier checkout page.

Here is the problem. Upon clicking the checkout link in our website, If the user does not have a prior Patreon account, they will be redirected to a “custom pledge” of €5 (which is apparently the minimum pledge amount?). The bigger problem is that this does not grant our users access to the locked content on our WordPress website.
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However, if we instruct our users to first create a Patreon account, and then proceed to our website and click on the Patreon checkout button, then they are taken to the correct tier, the €7 tier checkout page.

Is there a way that we can create a flow in which, the user, without a prior Patreon account, clicks the Patreon checkout button on or website, is redirected to Patreon, wherein he creates a new user, is then forwarded to the €7 tier checkout page, and upon successful payment data entry, is directed back to our website with a new WordPress login?

This would require changes at Patreon side, its not something we can do from the plugin.