I’ve only used virtual brevet cards.
For the controls, if riding from/to home I use the postcode, then name a small village or 2 as the intermediate controls. The last bit is a tick in the box exercise, it doesn’t impact your ride if you are validating by GPS and following a mandatory route.
Check emails that the SE Organiser might send you if you enter virtually rather than using the physical brevet, as he has a new process for inputting details of DIY rides using a Google form. It’s straightforward, and is clearly explained in the email that he’ll send.