Perhaps have a look of tempeh, it’s more digestible that beans (because pre disgusted by shroom) and already comes with a slight nutty flavor but that stuff is a songe (shroom…) and get impregnated sigh any marinade very quickly.

The tvp are tasteless by design, my way is to use them to mimic sliced beef recipes therefore 1) they get different flavors depending on what I cook 2) they trigger my memories and those makes me feel more taste that they are.

For the beans digestability another tip is to remove/by dehulled beans, that’s the hardest part to digest. Also soaking them overnight is a big help for digestion.