An option is to add a high visibility items.
Because like you I have the same military induced instinct to blend in (US army 1977-1983).

Some of the aviation type silk (SRU,aircrew) panel markers, and or blaze orange bandana's.

These fold up small and are always available when you want to be visible.

I find it hard to always have on clothes that are high visibility.

Also an aviation type "space" blanket with dual od/orange sides or a heatsheets. These all weigh nothing and take minimal space.