Not unless someone buys me the plugin (as it’s paid), but even then I can’t guarantee it. It depends on whether I can reliably check for its custom scene (if it uses one) and somewhat on how that plugin is implemented.
I assume the current issue is that the 3D scene doesn’t become ‘live’ as menu background? If it’s an actual crash, then I might be able to fix that problem from the error message and stack trace alone.
You could gift it to me here on itch.io (“Give this Plugin as a gift” checkbox), that’s easier in terms of fees. (Just as disclaimer: This is a special case where I won’t charge any commission fee for establishing compatibility with a paid plugin, since I’m quite interested in supporting this for my plugins myself.)
Just make sure the plugin isn’t obfuscated or such first, please! Wouldn’t want you to spend that for nothing.
You can find private contact details on my support contact page or join my Discord if that’s convenient and DM me there.
I should be able to check whether it’s possible within a day or two, and I suspect I can finish this, if it is reasonably possible, within two or three weeks.
