Lynx is probably the best of a good bunch regularly used in open cockpit microlights.
They do use their own plugs and approach to power so you really need the whole helmet / intercom system - just the helmet alone may not work.
Alternatively, there are Lynx and Communica helmets that will just go over the top of your DCs. If you only plan to fly open cockpit a few tens of hours a year, then this will be a much more cost effective option, and perfectly workable.
But, basically, look to the microlight world.
G