Ah… I see and I understand. It puts you between a rock and a hard place though, unless you start buying z-wave from now on. 
I hope some-one has some other magic for you.
I think I’ve seen people do a Zigbee reset followed by a backup restore but I believe that gave only temporal relief, and it is also not without risk.
I myself did have some success adding devices shortly after a reboot (when not all direct connected devices have reported in I presume).
There’s also a procedure on the forum that Athom suggested, which was in short to turn Homey upside down to enter setup, press alt to reveal an option to download a full firmware while holding all settings. That is a rather safe first option I think. The steps are posted here: Zigbee issue (5.0.0-rc47) - #6 by harmenkuijer but of course you should omit the zigbee reset step in the end.
