LNDHub is FOSS, so you can still run your own implementation. It's just that Bluewallet isn't going to be offering their own instance of it in their app. And AFAIK, you should be able to export your nsec, and everything else to wherever you want. I'm following a guide on how to open up some services on my tor-only node to be able to access it from clearnet. It works, but I'm still having issues with LNURLp. I'm always willing to help bitcoiners so let me know if you want some help