Hello Germanicus, and welcome to the forum!
I play CoE with 28mm models, but am increasingly using multi-figure bases for my models, with up to 6 miniatures stuck to a larger base, because I think it looks better, and makes moving units easier. However, I have a number of smaller and individual bases to use as 'change' for casualty removal, to accommodate changes in formation, and the like.
You could just do the same thing with 15mm models - have most of them on larger multi-figure bases, and then just have a few on individual bases to use as 'change' in battles. Though leaving dice next to 'wounded' stands is not a bad idea, in games with multi-wound models, I always have a bad habit of accidentally using the dice used to mark remaining wounds for something else, and then forgetting what number it was on.
Anyway, it is just a thought.