I think you have a good plan in place dakski. The Nitrogen cycle is a fickle beast for sure and it took my longer than I'd like to admit to feel like I really had a good grasp on what I was doing with it.
If Seed isn't working for you quick enough, I've always had a lot of luck using Tetra Safestart Plus. I've speed cycled some tanks when I needed to set up a quarantine tank for some reason with that stuff, and all I can say is I was thankful to have a few bottles on hand.