You need a dish - I too live in a 200+ year old cottage but the dishes these days are really not that big and you can always place them away from the house if necessary. The system is not flexible enough for your plans but you can have multiple boxes and use them independently. You could have a separate Sky box upstairs working as V.Aux and retain control over the main box if you have Sky+ downstairs so that you can watch recorded programmes.
The alternative , if you cannot put up with a dish, is to use a separate Freeview recorder - choose wisely - I believe Topfield are a recommended brand - and the same level of integration is possible. To be honest, I am not sure why anyone gets the B&O module as it is pretty poorly specified. External boxes can be replaced cheaply when new technology comes along and cost a minimal amount compared the the B&O product. The quality of picture would not seem to be an issue.
My B&O Icons: