Okay I just vibed this. A static web page that can be hosted on github, and a python script that runs on any computer. Requests are sent via nostr DM and the script serves unique addresses from an xpub back via DM. You load the python script with an xpub and nsec, but you can an nsec dedicated to this purpose, dont use your actual nsec.
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The xpub used is the seed phrase "gym gym gym gym gym gym gym gym gym gym gym gym" so you can test the addresses yourself. Just dont send any sats here haha.