Did some more research on the feasability department to see how much was done remotely on Big Brother so far.. and the most interesting has been Italy, where production used to be a bit spread out (and the studios used to be further away from the house than Movie World is away from Dreamworld). But then I came across ITV which produced both the UK and the US version remotely at one point. The UK version had production in Spain, but two control rooms in the UK, operated all cameras from the UK, had 64 video feeds and 16 record streams (the most record streams that I've read about for BB was 8, but that depends on the country.). The US version was filmed in Hawaii, but all the controlling and editing was done in LA, with n 18-hour turnaround, with some of the logging apparently also being done in Sydney.
And again, I'm expecting the BB control room to be on site.. but if Love Island can do it, I don't see how it wouldn't be feasible for Big Brother.