I suggest a multi-currency mode, and make it configurable through the Character Config windows. For example, let us choose to display "123 Gil, 456 Seals, 789 MGP, 0 Law, 0 Esoterics" in one line as the gil hud element.

[ ] Right-click cycle gil display HUD
[ ] Display/Cycle the following currencies in the gil display HUD:
__ [ ] Gil [ ] GC Seals [ ] MGP [ ] Law [ ] Esoterics [ ] Allied Seals [ ] Centurion Seals

When right-click cycle is checked, then right click will cycle through the checked currencies. If right-click cycle is not selected, it puts the gil hud element into a multi-currency display mode that lists all the checked currencies in one line.