You've got some non-Warforged PCs, right?
If so, don't use the Warforged PCs for dream-portend targets. Use the other PCs.
You can get the Warforged players (not PCs) involved, too: hand one or both of them a script to read from. They do the funny voices for the dream-portend. The whole party can be involved in the analysis, too.
It's okay if some characters don't get to participate, just make sure the players are all engaged.