Finesse-able / Agile Quarterstaff. Any way?

[Kazaan]

Had an idea for a thematic weapon and need to know if there's anything already present that allows a Quarterstaff to be finessed and have the Agile property.

Spoiler:

The idea was a "Duality Quarterstaff" with Agile + Vicious on one end and Guided + Merciful on the other. Then I realized that Agile requires a finesse-able weapon, which the Quarterstaff isn't.

So, do I need to start applying houserules or is there already a RAW way to do this?

[Umbranus]

When using the quaterstaff as double weapon the offhand side counts as light weapon and would thus be finessable. But only as long as you use it as the offhand when two weapon fighting.

[Kazaan]

It may or may not count for Weapon Finesse in that specific situation, but the base weapon doesn't count as a finesse-able weapon so it wouldn't work for applying the Agile property. Furthermore, it only counts as a light weapon in off-hand for determining penalties for TWF. So I don't think it'd qualify for things like Weapon Finesse or Piranha Strike or other things that require a light weapon.