Cached devices Homebridge
I might have missed the topic, but couldn't find anything comprehensive.

The moment a device (shelly) was discovered by homebridge it becomes a cached device. Once it is in that status you can't change IP addresses or connect it to any other homebridge. The UI on port 8181 has a button "remove", but at least in my limited trial and error mode I don't think it removes the devices out of the cachesaccessory file to be rediscovered afterwards. 
It would be good if this was the case and was clearly defined in the wording, such as "revomve device out of cachedaccesories".

(the root cause is separate VLans and adding a shelly by the app piushes it into the wrong network, hence I usually adjust the IP afterwards)

As I said, I was just able to do a quick trial and error run and as it didn't work I reset one of the shellys which was promptly rediscovered. But I couldn't do the test the other way round to ensure it wasn't just the reset. If the above is correct, considere the topic as baseless.
