Cool story.
I have a similar interest in barley for brewing. I like to find heritage or land race varieties to try.
I often use Maris Otter[1], which is quite easy to obtain. However, others like Hana[2] and Chevallier[3] can be more difficult to buy.
Scottish Bere[4] is another grain I'd like to try, but haven't been able to find any for sale, either whole grains or malted. Seems like only flour is available.
[1] https://en.wikipedia.org/wiki/Maris_Otter
[2] https://crispmalt.com/news/a-behind-the-scenes-look-at-hana-...
[3] http://zythophile.co.uk/2013/04/15/revival-of-ancient-barley...