Let me know how it goes when you get to the kingdom stuff. It will be at least a year before I'd get around to running it. My group is on level 4 of Abomination Vaults and we're planning Stolen Fate as a follow-up since both pair nicely to get from 1-20. Some in my group have expressed interest in Kingmaker, so that may end up being what we do after Stolen Fate. We'll see.Sure. I'm on Foundry. There are some maps that are available for free, already made with dynamic lighting and all that. The maps go about 75% through the book. I don't know if the fan will finish the series or not - but likely the official module will be out by the time we need them. All the NPCs and monsters are freely available through the compendium, so no issues there. I would expect no issues at all if you want to run it "with the kingdom in the background."
While we haven't gotten to the kingdom portion yet, there are fan-made tools on Foundry. There are sheets for the kingdom, macros for the actions, feats in the compendium, etc. So the party is going to use the free PDF of the player's guide and handle a lot of the stuff just using PDFs. I expect the full module to be out this Fall - so I don't think we'll be stuck with the low-tech option for long. Even so, I don't think it's going to be THAT challenging.