Quick reminder: the [[A]] symbol is code for "action," and it will have a special icon in the actual Pathfinder Playtest Rulebook and other products. You'll also see an [[R]] later to represent a reaction.
I know it seems like a small thing, but this will be extremely annoying for me. Using custom symbols means we'll lose information when copy+pasting. Screen readers (for accessibility) will also likely fail on them, and homebrew statblocks will not include the special symbols.
Please, please consider using normal text for these. I think [[A]] and [[R]] work just fine.