I've just done a AG dunklewiesen with the same problem came out at 1.020, I warmed it up stirred up the yeast added hops nothing changed it, so i bottled it and it's now mostly drunk :)
I started putting 200g of oats in my beers and the head I started getting was fantastic, i did a couple kit AG without them and low and behold no decent head so back in they went :)
I did something similar this weekend;
5.5kg MO extra pale
200g flaked oats
1kg Flaked wheat
20g Magnum 60m
I chucked 60g of NS in when the wort got down to about 75c
1.060 no idea how it will turn out :)
You'll be surprised how quickly you can drink through it when its good :)
I do 5 gallon batches and now try and have 2 batches fermenting at a time ><
(Plus when your friends tend to come round alot more when there's good beer kicking about.......)
my only undrinkable (well undrinkable is a strong term) was a Saison kit, it wasn't https://www.the-home-brew-shop.co.uk/acatalog/New-World-Saison-Beer-Kit.html was it?