I'm afraid historic crops are not my speciality, however of the seeds I've got Sea Cabbage is an unimproved vegetable, as is the Good King Henry Sweet Cicely and Angelica. Many herbs were brought with the settlers and became invasive weeds in the US as well. I'm thinking broad leaved plantain - didn't the people call that 'white mans' footsteps'? Also they used to use as 'pot herbs' many other plants we now don't consider as food at all (like the plantain).
There are a few seed companies that do stock historic varieties; I'm thinking of Thomas Etty and Pennard Plants for example. Thomas Etty has a list that may be useful:
seed timeline
I also found this website:
https://www.simplesite.com/theapothecary/4732220 which has some fascinating information of the (earlier) Elizabethan age and may have some useful information for you.