If you have enough time before your TC starting then part time might be an option where firms do not have bespoke SQE prep courses.
I would expect those firms who use BARBRI would be flexible particularly with location as it’s effectively an online course.
I’d also say the higher the maintenance grant, the more likely there won’t be flexibility with location as that grant is calculated on the basis of you living in the location of their preferred supplier.
Firms may consider personal circumstances on a case by case basis - but I think it would need to be something more substantial than just wanting to be out of the U.K. (and that could raise a bit of a red flag to them too).