Cloudfront, ELB, Failover, HTTP POST

Hello,

We had a configuration where we used the DNS Failover "Evaluate Target Health" feature in Route 53 to support an EAST and WEST Region ELB.

We recently introduced Cloudfront into our architecture and intended to insert the two ELBs into an origin group for our Cloudfront configuration.

Unfortunately, it looks like when we do this we can't support HTTP POST as it becomes greyed out when we define the origin group and associate it with the distribution's behavior.

I considered trying to do some sort of DNS failover pointing to the Cloudfront distribution and maybe a second distribution... but from what I'm reading this is not the right configuration because "Evaluate Target Health" will not work with Cloudfront Distributions.

My question basically is how do I support failover between an EAST and WEST ELB, behind a cloudfront distribution AND support HTTP POST (as the application behind the ELB includes components such as a ping identity platform where HTTP POSTS are necessary).

Thank you!