As a fairly irrelevant point there wouldn't be the existing FTTC and FTTP deployment types available at the same premises at the standard prices. FTTPoD is a different kettle of fish.
I don't see how there could be any problem at all supplying one to No. 21 and the other to No. 21A. I can't see any logical objection from Openreach to delivering both to No. 21 anyway. Or is that what the video was about? Just a curmudgeon rule?
Given the cancellation periods for each, whatever the FTTPoD time turns out to be, it should be possible to just go for it and see what happens.
What we don't know are the requirements of the target system in business/technical terms rather than supplier policy. These could influence the way it is approached and the financial risk strategy adopted.
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