Have you test ridden a Hooligan? I'm 6' and fit on them just fine(own 2). If I raised the stems all the way up,I'd be decently upright.
A full suspension,geared BMX bike would have to be a complete custom build. A Hooligan could take a suspension fork,if you could deal with a hardtail.
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Dahon Speed Pro TT,Brompton S6L/S2E-X