Weeds / Brambles etc...

I was thinking similarly Broadway, except I'd not put in in my "good bed" instead I'd make a new compost heap of sorts, your weedy stuff and some new greens at the bottom, and pile up some more compost able material above, let it rot down some over winter then put a few inches of top soil or compost on top to plant in to. Either squash, courgettes, broad beans etc.
The only reason I'd keep it separate is in case everything germinates in there you can just scrap it as a bed and turn it over so it's a compost heap again.