1) Tweaks to channel 7 format (assume non launch or finale week, i will share more detailed plans for those another time):
Premise: six episodes per week, hour long in duration, airing from Sunday to Friday, all filmed the day or two before, housemate and viewer rest day is Saturday, no live feeds nor shows with live audience, no fake evictions or other silly twists, ten week max runtime with twenty housemates.
Sunday (filmed Thursday and Friday): Shopping (24 hour weekly shopping challenge intermingled with housemates being housemates).
Monday (filmed Sunday): Nominations (post eviction fallout, nominations challenge with winner immune from noms, nominations themselves).
Tuesday (filmed Monday): Eviction (pre eviction scramble, eviction ceremony, quick post eviction interview with Sonia at the front door).
Wednesday (filmed Tuesday): Nominations (post eviction fallout, nominations challenge with winner immune from noms, nominations themselves).
Thursday (filmed Wednesday): Eviction (pre eviction scramble, eviction ceremony, quick post eviction interview with Sonia at the front door).
Friday (filmed over the week): Up-late (Housemates talking about politics, religion, the global economy, and a few nip slips and d*ck pics too).
Pros: Cheaper to produce due to no live feeds nor shows with live audience, allows channel to air weekend sport without BB getting in the way, far less chance of producer manipulation due to 24 hour turnaround during filming yet allows inappropriate content to be edited out before it goes to air, strikes a balance between the rushed three evictions per week seasons and the long one eviction per week seasons.
Cons: Viewers do not interact with the program until the live grand finale.
They've already confirmed live evictions, live nominations and a 24/7 live feed so that plan is an utter nonsense. Your plan would guarantee the show is dead on arrival and lose all the supposed production benefits of pre-recording it too. Live TV is actually one of the more cost effective ways of producing TV - it's running content through the edit suite where the costs can begin to mount up.