If the committee was just advisory and anything agreed to was put to the chambers then it would be constitutional. However the triggers and other powers they are delegating to the committee circumvent the essence of the Constitution and therefore makes those things unconstitutional. I suspect there will be legal action taken challenging the constitutionality of those powers, derived or otherwise delegated.
The whole Congress still has to vote, however. Since the triggers would be in the legislation, I see no unconstitutionality. I doubt this the first time legislation would contain wording that indicated something would happen, if something else happened.
This congress can set the rules for this congress, not beyond that.
HUH?!?! You're kidding, right? What are laws, but rules in legal format?