After short discussion and some internal decision-making, it seems that Bioware is willing to bring back the special vendor that sells White Acute Module for Patch 5.1.2. This item prevents bonus XP and neglects the effect of the Special XP Events. Bioware is trying to make it so that this vendor and item are automatically attached to the appearance of any XP events for the future.
Ok so I can confirm that in 5.1.2 on 2/28 we will be reintroducing the vendor which sells the White Acute Module. It will work slightly different than last time in that instead of only suppressing bonus story XP, it will suppress all XP earned up to 2.5x (to cancel out the event bonus). Also, we are working to “bake it into the event” so that in the future anytime we run a bonus to XP, the vendor and module will be available as an option for those who don’t want the bonus XP.