Oh, sorry mate! It is a bit late here, and the Ganja I just smoked hit me really hard...
Now, for what your question really was. To use Syrian Rue as an MAOI, nothing more than 3-5 grams of seeds is needed (Ott 1994; Shulgin 1997; G&Z 1986). If you have a 10x extract, 300 to 500 milligrams would be sufficient.
I believe the route is fine, although you should consider taking the capsules at the same time. Personally, taking DMT and MAOI at the same time appears to make the journey more "authentic", i.e. more like real Ayahuasca. There is not only the MAOI effects of b-carbolines that make Ayahuasca so special, it is also how greatly the harmalines synergize with DMT. You are, however, correct that the inhibiting of MAO is best about 30-45 minutes after ingestion.