This is a nice balanced system. I don’t know whether it can run in a positive pressure mode:

https://products.zehnder-systems.com/en/product/zehnder-comf...

Its big sibling, the Q series, can run balanced or at a configurable amount of imbalance.

These are really neat, but they’re intended for a pair of holes in different rooms. Maybe you can get one and get it to run in supply only mode:

https://www.lunos.de/heat-recovery