SWIM used to take morning glories pretty often in his pre kitchen chemistry days, and eventually developed a method that used dry seeds.
Of course taking the seeds as is is pretty difficult, and will only be left for the truly brave explorers, so SWIM tried many methods to reduce the nausea, stomach pain, vasoconstriction and sedation that accompanies the pretty mild psychedelia of the heavenly blues. He settled on a method of sifting the freshly ground seed powder through a fine metal tea strainer, collecting the morning glory 'kief' and dosing that out at 2 grams. The powder can be shoved into 4 capsules, and is equivalent to about one hit of acid.
Vasoconstriction and mild nausea are quite present on this powder, but SWIM never experienced stomach pain. It is pretty sedative, but very psychedelic as well. The effects seem to be somewhat stronger than with a cold water extraction, or any extraction SWIM has tried. The effects of this seed powder alone, used merely in combination with cannabis, has led to some very interesting places comparable to mushrooms.
Perhaps one could try a CWE on this sifted powder. Sifting the seeds definitely removes some of the unpleasant effects of eating the seeds alone.
SWIM also used to combine this raw seed powder with syrian rue seeds that had been processed the same way. Syrian rue drastically increases the psychedelic effects of morning glories, and makes the negative effects much less noticeable and more tolerable to SWIM. This was many years ago, though, and SWIM thinks he would probably vomit this concoction up within minutes if he tried it again.