VSS'd 6807s: Etherchannel routed links using SVI to Dists. Any thoughts on design guides and pitfalls I may reveal it doing this?

I am considering rolling out a new core design where we have two 6800s in two geographical locations (1/4 mi. apart), and each major distribution switch is connected to a port on one physical unit and also the other. The current core design is using equal cost multipath EIGRP, but I feel like we can move toward another configuration design for the new core (NüCore).

My thinking was to LAG the interfaces at both ends and build routing across SVIs using EIGRP. So instead of a physical port acting as the routed link, it would be the port-channel. Is there a massive performance hit here or am I not fully thinking through the architecture in this idea? I'm open to suggestions and caveats on this.