"neither death, ... shall be able to separate us from the love of God".
"we are made a spectacle ... to angels"
It is the job of the saints here
1 Timothy speaks of interceding of the living. The notion that the living can intercede but the saints in heaven cannot is speculation. Write a novel.
BD made an excellent point, and I didn't see your response. Paul says flat out that he had finished his course, that his work was done. Since Paul was so dedicated to praying for others, why would he say something like this if he had any thought of continuing prayer for others in Heaven? Paul gave words of encouragement to others all the time. It would seem automatic, to me, that he would comfort his disciples, especially in writing, with the knowledge that he would always be praying for them, even after he is gone. Yet, Paul appears to snub them all. That is, IF he believed as you do.
Another thing, in order for a saint to know how to intercede for us, he must have some knowledge of what's going on down here. Are all of them watching us all the time? Is their business about earthly matters? Or, do they go about their business in Heaven until a prayer request lands in their in-boxes? That might work for a while, but what happens when every single person the deceased ever knew has died? There will always be a point when no one is asking for your intercession anymore because no one even knows your name. Too much time has passed. Are they lonely? :) And, with over 5,500 canonized Saints, I'll bet that even some of THEIR in-boxes are pretty bare.