This will be similar to 3-way dimmer switches. I haven’t done it myself but here’s what I recommend testing:
Associate group 2, 4, 5, and 7 from the non-controlling switch to the controlling switch (load doesn’t matter, it’s the one that is commanding the fan shroud hub via RF), and group 3 and 6 from the controlling switch to the non-controlling switch.
Here, on page 10 is the group descriptions: https://support.inovelli.com/portal/api/kbArticles/407409000002102001/attachments/kw8eq50c812f5d3344bc08295860b8b394c7c/content?portalId=edbsn8bb12d5f5a97d693e61ce4ce8a23f8b0e323eac44a6c2794f893e912acf005df&inline=true
BTW, I’m not even sure if this is possible for an LZW36 to operate without a fan shroud unit, but its worth testing!
Edit: I referenced this thread for proper 3-way association between two dimmer switches: 3-way setup with two LZW31-SN dimmers in HA in endless loop - #5 by analogue