Podgorica should work but I think the route needs a bit more support. There must be some business demand on that route and it isn't that far away from the touristy parts either.
A once a week service on a Saturday won't however do much for anyone seeking a city break, or going there on business. BA holidays will need to have a decent offering in the costal resorts to keep this one viable.
Pristina I can't see lasting without additional flights either. Kosovo isn't a huge tourist or business destination and I don't think a once weekly service will do much to attract people to visit. I hope I'm wrong as I would like to use this service, but we will see. I think at a minimum there really needs to be another pair of flights mid-week, either Tuesday or Wednesday, to give it a shot.