ok.. after seeing that thing, i'd say your only course is to Email the Company and hope that they have a socket for that oddball BB.... Or go pyro and heat that sucker up and get out the 3 ]b. sledge and a punch, and SERIOUSLY Lay into it this time...
or go full-on crazy destructo and start by drilling holes in the cups, in three lines, at 120* intervals, then go at the cups with a big chisel and hammer to crack the thread area. some additional cutting with a rotary burr (Dremel or better) may be needed too...

but before all of that... Is the frame WORTH all that effort?