SSL Offload and remove FQDN

Is this possible using an F5 iRule? 

I only really know the basics of F5, but it seems like it's something that should be achievable? 

We have an internal site that is only accessible via a short name, I'm aware that this is a complete fudge, but to get the supplier to fix is expensive and will take a long time - it is also out of my remit to sort unfortunately - so as an interim solution I was hoping to utilise our F5 to SSL offload - I have this bit working fine - unfortunately if you try to browse to the site using FQDN it doesn't load, so I need to strip off the domain name from the URL during the SSL offload

any help would be much appreciated