They need such a small change to make them viable again that I'm really hoping there's time to slip it into one of the June patches. Just make their projectile hits grant 2 stacks towards charging their special shots instead of 1. This would give them back the ability to charge their special shots in 3 hits, like they could before the Heresy rework, instead of 6, which was such a massive nerf.
If there's time, it would also help a lot if you could give Edge of Concurrence back the ability for its Lightning Seeker to count towards charging the next Lightning Seeker again (by granting stacks on direct hits), which was another nerf Concurrence got hit with in Heresy. If that's too complicated to implement in time, then maybe just a simple damage numbers increase, to help compensate for the nerf?
Those of us who came to enjoy using the class glaives before the Heresy nerfs would really appreciate it. I never realized how much I loved those glaives until they were nerfed into unviability.