How to dynamically add certificates on Amazon Cloud to enable multidomain SSL comunication?

I need to manage multiple SSL Certificates on Amazon ELC
instances farm, running multiple domains on a Ruby on Rails
application.

The problem is that we need to
dynamically add new certificates to the instances or balancer to provide SSL. We need to
do it every time a new domain is directed to our application, or when a domain already
linked is selected to enable SSL and a new certificate is
uploaded.

At this moment we have one Elastic
Load Balancer and 8 instances(and counting) behind it. But one ELB only allows one
certificate, and create one balancer per domain is not a desirable
option.

I'm thinking in complement the ELB with
HAProxy to share the same IP/Port using SNI, but I'm not sure if this is possible and
works on all browsers.
We tried to enable SSL on the instances, but required
to use as many ports as certificates so it's not easy to manage, and still have to add
more balancers.

What alternatives
would you try?

In your opinion, what's the best
way to dynamically add Certificates?

Thanks a
lot.

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