Add a pumpkin or two as they are a pound each and last a long time as long as they're not put by a radiator.
One large pumpkin should do you for a pumpkin risotto, a pumpkin chowder and roasted slices of pumpkin with roast sausages and red onion (or a pumpkin stew, or a vegetarian laksa if you have coconut milk and noodles in)
Do the chowder at the same time as another and freeze it to avoid being over pumpkinned in one week.
Medjara is a lentilly, oniony, ricey thing that's cheap and delicious- I use an ottolenghi recipe, but a google should see you right (can't link as on phone)
I would add some salmon portions, or any other fish (perhaps frozen?) And do a large pie early on, eat half, freeze half. Hopefully you will leave enough for baked salmon with broccoli (frozen if late in the month) and sauteed potatoes another night.
For easy nights why not add a few pastas or rice dishes? Pasta pesto, tuna pasta, add some bacon to your list (which usually has a good date on it) and carbonara? (presuming you have eggs) and with the remaining bacon and a few potatoes, and a carrot you could make a pan haggerty the day after your carbonara.
Or easy rice dishes? Egg fried rice, jollof rice, veg risotto.
And add a whatever is about to go off veg soup- long term meal plans always include these in my house, usually once or twice.
If you're really not going shopping at all in the period bear in mind milk and bread freezes and most veg can be blanched and frozen from fresh. (I was once incapacitated and too poor to pay repeated deliveries so have done this myself- though I do prefer fortnightly planning as it leaves me with fresh food throughout)