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If they aren't eating their layer feed... instead, opting for those treats you mentioned, I'd at least make sure to have a dish of crushed oyster shell for them to eat - they'll need a lot of calcium for making egg shells. Though, IMO, they really shouldn't be given so many treats that they don't eat their regular feed. If you check around BYC, you will see a lot of people recommend treats be no more than 10% of their overall daily food consumption.
It's winter. Hens that start laying in winter sometimes take a few more weeks to get started. Give them time. Free-ranging a greenhouse sounds lovely. I'll bet they're happy! Let them eat a little less of the bird seed/peanuts/banana & apples. Don't stop, altogether. But make sure they're hungry enough each day to eat a good amount of their regular feed in addition to the greens and weeds they get free-ranging. If you give extra treats, emphasize protein over carbs. Good luck! Sounds like they're going to start really soon!