I recently came across this website http://www.indirectsound.com, which is an app aimed to support old d3d/eax games. I tried it, and it did create a log file indicating that it is loading when FA launches. While spatial sound option still can't be enabled. I did enable the 7.1 surround on my headphones ( that would normally cause the same issues as enabling spatial sound) and with this running everything sounded normal. Enabled virtualization in enhancements, and everything still sounded normal.
I do not have a set of surround speakers currently to test out, so i can't test any speaker options beyond stereo, but perhaps someone can report back and see if this works?