Chucking this in here so it can be found via google.
Gree manufacturs a minisplit with an attached miniature ERV, sold under the gree brand as a the “Envo”, and sold under the TOSOT brand as “Aoraki.”
The ERV kit can be purchased separately.
I built a control board that can control the ERV independently, and can be integrated into home assistant. It also has some inputs for sensirion air quality sensors and a CO2 sensor. This allows for a compact device that can provide fresh air to a single room when windows aren’t an option.