Done before? Toon picker

[Bettysue]

Carefully read those quoted macros they aren't the FTL macros, they are account based, you simply put all the names of toons that exist on account one in the first, then all then names of toons on account 2 on the second and so on. Since you can't have 2 toons from 1 account logged in at the same time it will select the current toon logged in as the target.
It's basically the same as putting [mod:ctrl, target=acountOnePallysName][mod:crtl,target=accountOneShamansName] into your current FTL macro setups big button.

Just read them over carefully they will do exactly what you are asking to do without modifying anything each time you log on different characters. I personally use this exact setup. It clicks a particular macro based upon the modifier set and that macro then selects a toon based on existing, and they only exist if they are logged in. The names are Toon A from account 1, Toon B from account 1, etc in the first macro. Then Toon A from Account 2, Toon B from account 2 etc in the second macro.

For this to work, make sure you make the exact same macros on every character for each account. /target [target=ToonAAcct4,exists][target=ToonBAccount4,exists][target=ToonCAcct4,exists] would have 3 blocks in it if you had three characters on that account or ten if you had ten characters. Most of mine have just 2 because I swap in a tank for 1 of my shamans, or my mages for boosting a different set of chars.