Redirect Video to second wan

Hi folks,

I got a FWF30 with dual wan setup and I need to redirect all video to wan2 to save bandwith on the main broadband collection. I got this running using policy routes, but it means to check FortiView Destination frequently to find IP ranges to make new and new FW rules. I'm wondering if there is better method?

My biggest issues are mainly about youtube, which uses different IP ranges and selects them almost randomly.

Thanks