Having taken mini-doses of rue for approximately 19 days in a row, I decided to take a break for a few weeks. However, the idea of combining rue with spices has been in the back of my mind, and I finally gave it a go today.I would recommend going with a regular hot water extraction, continued with waiting for particles to settle and then decanting. What is also important for me is the addition of some spices that you like. I've been adding cardamom to the teas with great results. Let your taste and imagination guide you. The roasted seeds will work very well in a recipe combined with spices, gives lovely oriental taste and effects. Since you've got lots of seeds to work with there is no loss in playing around with them.
I used around 1tbsp of loose chai herbs (ginger, cardamom, and such) along with 1tbsp of cocoa nibs, 1tbsp of honey, and 1g of ground/toasted rue. The resulting tea was extremely delicious, and seems to be hitting me, as I type this.
Depending on how I feel later in the day, I may have another cup. Thanks for the suggestion! It feels like a great approach and is fully congruent with my tea-loving ways.