I do a load of things by basically dicing up Mediterranean type veggies (onions, garlic, peppers, tomatoes, mushrooms, courgettes etc), pouring in passatta, seasoning well (S&P, oregano, basil, thyme, rosemary type herbs, maybe some balsamic vinegar if you have some) and throwing some lamb or chicken on top to cook.
Baby potatoes, sliced lengthways, marinated (10 minutes is enough) in olive oil, pepper, garlic granules (and sometimes some lemon zest and/or juice), sometimes some rosemary or thyme in there too - preheat tray, cook in about 40 minutes.
Another thing if you don't have a hob - do you have an electric kettle? Couscous only needs boiling water and seasoning - and that can be changed up too to make it more mediteranean or African/morroccan style accompaniment.
Has the refurb already started? Do you have a chance to make some lasagnas/shepherds pies etc and freeze these to just do the oven part? I also do a smoked fish and broccoli topped with mash, and a chicken and mushrooms in white wine/cream sauce topped with mash or pastry versions that can freeze well. And various types of pasta and sauce (tomato or cheese or white sauce based all work well) with veggies and meat (bacon, sausages, chicken, prawns all work well) that get served up from the pot on 1st night, but frozen and then made into a pasta bake with grated cheese over the top.