was thinking of a similar idea. Trying some Belgian beers to see which would be a good ideal base. Was thinking of strong golden or dark. Had a duvel and feel rye spicy would overwhem the yeast character. Was thinking rare vos with rye maybe? I believe their yeast is similar to 550. If you want we can try to create a recipe together.
I'm not great at recipe developement yet, and I'm definitely not an authority on Belgian beers. I was really just curious since it seems everything under the sun has been tried already. That said, if you try something, post it.
I think my next BDSA will be something like the Pannepot clone that the Candi Syrup people have posted, with a hint of choc and black malt. I'll see what that does before i try something different.