Dunno. dmt citrate however is slightly soluble in acetone. The solubility is around 4mg/ml acetone.
It is also a disgusting sticky goo to work with, so it is not very much recommended. Teh stickyness will make it impossible to wash properly, leading to impurities. the fumarate salt is more rocky and easy to wash throughout.
But irrespective of all these things, 2.94 grams of citric acid are able to hold (or in other words salt) 1 gram of dmt. That is, 1 gram of citric acid can hold 0.34 grams of dmt.