I have a solution for using Phottix odin while at the same time using another flash on body without using bracket .I did this myself for my wedding work.
1st ,get yourself a Nissin SC-01 Universal TTL cord http://www.nissindigital.com/SC-01.html
2nd, attach Nissin SC-01 Universal TTL cord on your body while phottix odin transmitter on the cord external hot shoe.
3rd, attach your flash light on phottix odin receiver.then attach it on the Nissin SC-01 universal TTL cord top shoue.
4th,keep the switch on Nissin SC-01 Universal TTL cord on EXT(external).
I hope this helps.I had been shooting a lot of wedding and event using this setup.It is always great to have on body flash as fill light while another off flash as key light/rim light.
However,lately the Nissin SC-01 giving me connectivity issue between the cord and my camera hot shoe.