I contacted Apple support, I'm hoping they will get back to me
My own experience of Apple Support is same as any other tech company. They will
1) treat it as an rtfm.
If that fails,
2) they will fail to understand the question.
They are wrong to do that this but, like every other tech company dealing with a 'consumer', it is likely. Personally I prefer to simply avoid 'tech support', when possible.
As regards 'forget this network' and reconfiguring, a way to mitigate the 1000 mile password might be, prior to the change, if the firebrick allows it, navigate to the router config page and tick 'show password'. You can then select and copy the 1000 miles, ready to paste into the new WiFi config?
If apple support prove me wrong, by solving the problem, I will be delighted.