Is there a way SE to fix DD DF ques?

[Mithent]

Also, any tank or healer that ... say, already has their nexus but wants to work on the nexus for their DPS class is stuck farming light on their DPS class. So there's some incentive not to play desired classes when you're working on that.

I main BLM, but also enjoy playing SCH. However, because I'm working on my Nexus on BLM (as and when, not grinding it as fast as possible), it feels like playing SCH for anything that gives light is a wasted opportunity. So I'm forced to add to the DPS queue instead of helping with healing. It's the most unfortunate aspect of the Nexus quest for me.