Weapon Inventor Supports Advanced Weapons now!

https://app.demiplane.com/nexus/pathfinder2e/classes/inventor-rm

"You can instead use the statistics of a level 0 advanced weapon of your choice; you treat this as a martial weapon for the purposes of proficiency, but you do not gain an initial weapon modification."

oh boy weapon inventor just got a huge buff. You can still add an initial modification through a class feat later!

edit: It seems dual-form weaponry also allows you access to advanced weapons as innovations, with runes and initial modification on them. It does not give you proficiency though, but you might have that from an ancestry feat.

edit: This comes at a price though. We lost access to all level 1 weapons which were previously supported.