I've been playing Te/Fi for a sort of 'bouncer' class, with dagger and talis. I fused a talis to daggers with multiweapon.
Normally, when you use the Talis PAs or weapon art, they persist for some time and will disappear on changing weapon pallet.
With multiweapon, the Talis weapon action persists while using attacks and PAs of the base weapon as expected, but the Talis PAs to alter techniques disappear as soon as you attack or use base weapon PAs.
Talis is not very compatible with multiweapon at the moment.