Personal preferences: I attempt to do my (badly freehanded) numbers black-white (black for a bottom-left shadow or general outline, off-white for the actual, slightly smaller number). On your green pattern I'd use white numbers if I had to choose.
Anything that's painted bright (or bright decals) will get toned down a bit with washes and weathering so if you do these, starting with very subdued colours they may become difficult to see later on.
And I
love hazard stripes in
reasonable doses
Smallish highlights in key places to make them pop a bit, like you said.
I'm not too fond of the look of a full-blown limb covered in this pattern, it gets a bit too distracting in my eyes. But again, it's a personal preference
Hoping to see pics soon enough!