Irule trigger applying to all pool members and just want it to apply to pool member with session_disabled

Have you tried this: https://devcentral.f5.com/questions/pool-member-status-page-on-a-virtual-server-v11-30188

Also, this iRule may provide a framework to achieve something similar but not the exact requirements that you need - something to try out:

when HTTP_RESPONSE { 
        if { [LB::status pool [LB::server pool] member [LB::server addr] [LB::server port]] eq "session_disabled" } { 
            HTTP::close 
            log local0. "HTTP::close"
        } 
}