Treadle feeders may be pricy, but they make up for it with lack of wastage. We had a pretty big issue with rats and within a week of adding the treadle feeder, they were all just 'gone'.
I sat out with the girls for two days and trained them to the feeder - no propping it open - and everyone took to it quite quickly.
The one I use is the feed-o-matic and only two hens can get in at a time to eat, so will be getting a second one when I integrate later in the year (to accommodate 6 hens total). Food stays dry and I think it can adjust down to as low as 250 grams. I use it with pellets and don't have any issues with food blockages or anything like what I saw on the product reviews online.
For waterer, I've always used the hanging plastic ones - only issue is when it's windy, it tends to blow all the water out and when it's on the ground, they tend to soil it quickly. Propping it up on a stand seems to work best.
For the coop, I suppose the question would be are you in love with it or do you like any parts of it that you'd want to keep? It may just be that a renovation's in order instead of totally scrapping it.
Also, those two hens gotta be pretty lonely when one goes broody... Chicken math; it's addictive!