My husband makes his own muesli, and I'm pretty sure he sometimes puts rye flakes in that (instead of oatflakes). So I'm wondering if it would make flapjack?
As I don't like the taste of rye bread, I've never thought to try it.
I do know that you could mill it finer and do a mix of wheat flour [white?] and rye to make a lighter loaf. Or add some flakes into a dough to make 'multigrain' bread.
I was reading in yesterday's Daily Mail about various breads to try whilst we're self-isolating, but I admit the soda & sourdough versions appealed much more!
Let us know how you get on, will you, STiG? It's interesting to hear about results of new techniques/recipes.