For macro scripting, the slash command system in Total RP 3 should resolve modifiers like [mounted] when executing a command. This would make the following command possible:

/trp3 [mounted] profile Flappy bird; [mod:alt] profile Happy cat; [btn:2] profile Moonmoon; profile Belyelle

Depending on the regex skills of the person doing this ticket, it might be better to resolve the string constructed and then pass the command, allowing the modifiers to be used for arguments too (have the conditional part after the profile command here).