Is it possible to write an Irule for SSL exception based on IP address?

Something like this?

when HTTP_REQUEST {
    if { [IP::addr [IP::client_addr] ne 10.55.22.22] } {
        HTTP::redirect https://[getfield [HTTP::host] ":" 1][HTTP::uri]
    } else {
        pool http_pool
    }
}

Add this to the virtual server listening on port 80 and replace http_pool with the name of the pool you want to use.

/Patrik