iRule to Decrypt and then Re-Encrypt outbound traffic

Here's even more detail- this is the stateless router we have that acts as a gateway for the servers behind the F5: http://packetpushers.net/stateless-routing-f5-ltm/

Since server initiated traffic has to pass through that router, I want to apply an irule that says

When a connection is made from x_pool on port 443 (or better yet, using the https protocol), Decrypt it using x cert then Encrypt it using y cert and send it along to the target out on the internet.

Now, that target will no doubt respond using y's cert, which then will hit the F5, and needs to be re-encrypted using x's cert.

Can that be done?