actually i just tried this and even though it looked good on screen, i was still just in the static conference i tried to transfer from, so i am back to square one :(

 condition      destination_number      ^760$      1     
  action      answer            3     
  action      set      conference_user_list=|      10     
  action      play_and_get_digits      4 4 3 5000 # askprivateroom2.wav ivr/ivr-that_was_an_invalid_entry.wav target_num \d+      20     
  action      phrase      spell,${target_num}      30     
  action      sched_hangup      +10 normal_clearing bleg      35     
  action      bridge      loopback/app=conference:${target_num}-127.0.0.1@dynamic_conf