Creating a phylactery for Wysteria will go off without a hitch. The resultant phylactery will behave exactly as a mage's phylactery.

Creating one for Gwenaëlle will have a hitch. Unless they begin immediately with drawing the blood from near the anchor site, early attempts will fail until they get around to trying that. Furthermore, the first attempt using blood from her anchor hand/arm will shatter or lightly explode during the creation process, at a moment that coincides with one of the anchor's mild brighter pulses. Maybe the second and third attempts to, if you want. However, with some trial and error and minor magic-nerd modifications to the process to account for the instability of the energy, Julius should be able to successfully create one for her as well. Her phylactery will behave differently than a mage's, with the glow that brightens or dims to enable tracking her also brightening and dimming in time with any pulses or flares from the anchor, but it will work.