This is easily done. What you need to do is configure Internet Protocol over Fibre Channel (IPFC) on a management VSAN that is available on your switches.
The documentation for configuring this using fabric manager in sanos 3.x is right here
http://www.cisco.com/univercd/cc/td/doc/product/sn5000/mds9000/3_0/fmcfg/part6/ipsvc.htm
The 10 second config summary is setup up a shared vsan (you can get more complicated with complex routing, but you don't need to) across you devices. Assign each device an ip from the same subnet on this vsan. On the switch that you do have mgm0 access put a route to that subnet.
Now all you have to do is tell your routers that the new subnet you created is available through mgmt0 on that first switch.
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