KVS Tool currently supports 2 POS options for Regular Availability (US & JP) and this is unlikely to change in the near future.
With regard to BA's UK POS, in most cases, you can actually take advantage of the more favourable POS US Availability (e.g. by calling BA's US Call Center).
Thanks, but this doesn't work for Joker availability, and recently when I've called the US office, they saw that the ticket was bought in the UK / UK BAEC address and revert to UK POS and GBP.