Bit of a risky combo to be honest with ya! This is from the DXM FAQ at the top of this forum. "DXM and LSA is also ill-advised as LSA can cause vasoconstriction, in conjunction with DXM's high blood pressure this could be unhealthy for the heart and circulatory system" There are a few reports on erowid etc of people doing the combo with no ill effects but yeah id tread lightly if you are going to attempt it.
I read about a Morning glory extraction on a sticky on cacti I recomend reading up on that to hopefully reduce nausea =].
This sounds like a really horrible, potentially harmful or fatal combination. Not to mention, yes, really disgusting. At best, you will be very sick feeling for a few hours.
Try it! You never know what could happen. It could be a brilliant combination, eliminating all the downsides of both drugs. Or, it could kill you