VBAL,
First - sorry for the delays in response, I've actually been traveling the last few weeks and not been able to access the forums as much as I'd have liked.
Now this is a very specialized question and probably requires a more detailed conversation, but some generic points here:
1) The SWG supports link aggregation no problem (actually this is the way you load balance multiple SWGs).
2) Generically speaking, so long as traffic is not asynchronous (TX and RX packet streams are all traveling through the same SWG per set), SWG should function just fine.