Have you considered a villa with paying someone to come in and doing some housekeeping plus cooking/ prepping lunch and dinner for you?
Many villas for rent you can get someone to do this. Give them a food budget for the week/ day to buy food in local markets/ supermarket, then they arrive at say midday with the food and prep lunch, then after will prep dinner for later and leave in fridge ( ie marinate food for BBQ, make salads, or bake a dish), and do a bit of cleaning ie floors, washing up majority etc. So basically paying someone 11am -3pm ish daily. Say 50 euros for those 4 hours. 350 euros a week. Plus food costs say 300 euros a week ( nice food, ice creams, beer etc)
750 ish euros for food and someone to prep.
Villa somewhere cheapish ie lake balaton Hungary, or mainland Greece, Croatia around 2000 euros a week+ for 8 of you
2000 euros for 8 flights approx ( maybe less depending on location)
Less than 5000 euros for 8 people. Less if you bargain good villa ( can be only 800 euros for example, and food bill could be reduced), so potentially 3500 euros for 8. Far cheaper than all inclusive to same standard for 8 ( usually £800-1000 each)