You may be lucky with timings. Bear in mind that the DSP5200s will have some delay due to internal processing, but I'd expect it to be commensurate with that of the OA08 and Behringer crossover...

SpeakerLink is effectively AES (Balanced digital), so you can probably make up some cables if you want to have a play. If you look at the Wiki at the top of the page, that should point you in the direction of which pins do what on the SpeakerLink output and how to connect to an AES XLR connector.

Cheers,

Steve