I’m no expert, but I think it’s best to go beyond just backfilling the stump next to the future path. The root system rots over time, which can cause subsidence. The best option, in my opinion, is to completely remove the remaining tree and create a stable base before laying the paving. However, in your case, it might be worth consulting with a specialist, for example, one from https://oakshs.ca/driveway-interlocking/ . They can help you find a comprehensive approach to solving your problem. I believe they can suggest the right workflow that will reduce the risk of warping and cracking in the future. I’d be glad if my advice helps you.
