Ok, this bread looks like it would be delicious:

https://www.theperfectloaf.com/soft-honey-buckwheat-sandwich-bread/print/13116/

However, it calls for freshly milled flour, which is not going to happen for me. It also calls for Buckwheat porridge, mentioning Bob's Red Mill, and they do not make that product anymore, although they do sell buckwheat groats, so perhaps I could grind then a bit in a food processor. I think that I have one 9 x4 x 4 pullman pan, but I would have to buy another.

Still, the recipe looks like it would be so good, even though Mario the Sourdough Guy's recipes are pretty fussy.

I will think about whether to attempt it.