So I've been thinking on this for a little bit.
What if we had an opacity changer that changed all your markings' opacity to what you choose?

I know they're already cheap as it is (2GB) but going through each and every individual one on top of having to scroll through and find your lion each time is mildly annoying.

Maybe make it an event only item? Say during November since there's the Ancestral Rewards where you can get Event NCL only markings.

Or a craftable item. Made out of shiny and rainbow stones sense you're technically "painting' your lion bolder.

Maybe a explore only item?
Karma related, +/- 1K explore encounter could have a low chance of granting it.

Or maybe even just a normal Oasis/Enclave/Referral item.
20GB? For both convenience and due to the possibility of more than 10 slots.
100MT?
8RP?

Edit: changed price because I was thinking of marking removal instead of the changer ^^;