I don't recommend drinking rue powder. You can literally make a tea in minutes if you're really in that much of a hurry.
If you search around you'll see that people dose differently. Some take them at the same time, others a few minutes apart, some 20 minutes apart. I just wait a minute or two. Try it different ways and see what works for you.
When you look at ayahuasca use in the amazon, the DMT and harmala containing plants are mixed together and ingested at the same time. Always works for me, but for some this doesn't seem like the most effective way. Individual differences are big here.
Best of luck
<Ringworm>hehehe, it's all fun and games till someone loses an "I"