I’m having trouble with this same remote, and interestingly I have the exact same setup - multiple fans on a single circuit, with a Shelly controlling power, all controlled by Home Assistant.
Right now though, I can’t even get the Bond to trigger the toggle functions. I used the bond-cli to do some live logging, and I see that it does seem to be sending some very long strings (they are truncated in the info level logs), but given that it doesn’t work, I doubt shortening the sequence will help.