On an additional note, I've been thinking about this for the last few days. I was thinking of using a Bretonian Carrier for such purposes but one doesn't really exist yet. So what I was thinking of doing was using a Shire or Shetland for that purpose. But, since you have posted this and there is obviously encouraging thoughts about it, I'm thinking maybe a Bretonian Faction specialising in this? After all, In RL there is the Royal Fleet Auxiliary.
My thoughts on how this would work would be for such ships not to enter combat unless attacked of course, so they stay away from battles. However, they situate themselves full of the usual stockpiles and stay away from the battle but still closer than a planet or station which they would usually use. Also move around and situate themselves onto patrol lanes to rendezvous with squadrons, ships etc
But yea, by positioning themselves say 30k or more from the battle, they are unlikely to get detected. But with serious RPing, enemy forces could hunt them down, so maybe this is where the BAF could also get involved with escorting such ships when necessary.
Of course, this is all just a suggestion on my part, but I do really like the idea. Especially since Bretonia is currently lacking a Carrier or similar vessel, I think this would also be a good enough reason to get one in the future. In the meanwhile, I believe Shires and Shetlands would be suitable for this purpose until something better comes along?