I'm pretty sure those options could be remotely switched on and off as required. On the later globe, 'Subtitles' and 'Stereo' were optional extras, plus I think, 'South East', as NC1/2 used to announce regional programmes once everyone else had opted out. I don't
think
there were separate South East symbols recorded on the laserdiscs... I'm sure some one will correct me if I'm wrong. I think the clock generators could add all of those options too as required.
Laser discs were recorded clean and distributed clean. The BBC logo and regional identifier were added by a local graphics and keyer combo (IPK LogoGen or LogoGen 2 from memory) which was part of the laser disc set-up. Memory is hazy but it could be that there was a Logo Gen used for the original blue/gold globe, and a LogoGen 2 for the CRV laser disc system. I'm sure if someon has the time to scour 'Eng Inf' online they will see something on it. (*) You could add or remove the keyed logo manually - and select which of multiple logos were inserted - as well as which track on the laser disc was cued and run. Many regions used the spare space on the discs for their titles or other sequences (it was effectively a nice, easy-to-cue, titles player).
(*) The idents weren't played from consumer laser disc players (good though they were). Instead Sony's CRV which was a component analogue optical recording system was used. This was a WORM system (Write Once, Read Many) - which meant the discs were not erasable but were designed to be mastered and then played frequently. They were far more resilient than tape - though as they aged they did suffer from drop-out.
Regions got players, but Network had a few recorders in London, so whenever a region needed to add a new ident (or titles) to their discs they would send someone down to do it at a booking in London.
BBC News also used the CRV players for playing titles, and the animated slaved backgrounds for the 'Virtual Blue' One/Six/Nine (and Business Breakfast, Breakfast News for a while) as well as the backgrounds for the all CSO/Chromakeyed 'Working Lunch' original look. They continued with the CRVs for titles well into the 00s - when they were replaced by a BBC in-house player called 'Stingray'. (English regions got a replacement for their CRVs called Vera - a nod to the original ill-fated BBC VTR)