Maybe we need a single ACW tartan for use by all.

But on the main question asked by the OP, I say go for it. The only ones likely to ask "what tartan?" will probably be open-minded to whatever the answer is.

Most of the time people will probably just say "A kilt! Wow thats cool." And move along.

One of the things that I believe sets kiltwearers apart from the general public is a total disregard for what the public thinks.
Speaking for myself, I haven't been too concerned with what people think about me, and now sure isn't the time to start.