Extend subnet on layer 3 connection without going through intermediary switch

So, I have this topology. I know I can plug the Primary ISP into the 3850 and then into the ASR router for it's L3 connection and use a L2 vlan to transport this. However, I would like to do the same thing, without having to demark in the 3850 first and go straight into the ASR router. I am trying to think of a way to do this, but I think I might be SOL.

I was thinking about maybe being able to assign a vlan-ID to the port and then use a subinterface with dot1q down to the 3850. Any ideas?

Thanks!

https://imgur.com/a/p8sGR