Making Siri easy to access hands free while riding

I have a new Momentum EVO helmet which I am just getting to know and so far really like. But I am struggling to find an easy way to access Siri on my iPhone whilst connected by bluetooth to my helmet while riding. Can a SENA voice command be added to make this possible. I have noticed that I can wake up Siri using the Momentum EVO utility app by selecting Voice Dial from the remote control menu but can’t do this hands free while riding. So perhaps this command can be activated by a new SENA voice command. In my mind access to Siri is very important as it can be used to request directions to a destination or can be used to help find the nearest gas station or hospital while riding. Hope you can help.