This is something from INNUOS when I was inquiring about a PSU
I believe the Sbooster will technically be okay. It is not something we have tested, but if it will run a ZENmini then that means it can run a PULSEmini also.
The warranty could still be voided if a fault develops that is determined to be the result of the power supply source, so this is a general risk of any and all third-party power supplies.
Our own LPSU offering for the ZENmini does also work as an upgrade to the PULSEmini.
This email was one of the main factors of me getting the ZEN mini PSU. Still, I think it would be fun for someone to a/B the two. And see if there is a difference.