Routing git traffic

You could try using an iRule that will re-write your git.example.com/uri URIs to their corresponding BitBucket URIs and forward the traffic onto pool members that are Bitbucket IPs. I would definitely test this before directing your developer traffic to it. i.e.

when HTTP_REQUEST {
    if { [string tolower [HTTP::host]] equals "git.example.com"} {
        HTTP::host bitbucket.org
        HTTP::uri /newpath[HTTP::uri]
    }
}