Hello - We are working with our contractor to figure out how to install our backsplash. We had picked out a 3x6 subway tile for the design above, but due to the 1/4in substrate we need, and the fact that the tile we picked doesn't have a corresponding pencil edge to cover that substrate, we are at a crossroads. Any ideas on how to edge this? One idea is to just tile the whole wall or to pick different tile entirely (one with a strong cap or pencil detail).

Here's a picture of the kitchen before the demo to the addition:

Thanks for any insights/ideas.