R,
Thanks for using our plans! Regarding the 10K, like most answers, it depends. That 10K is so close, and I assume that your triathlon is a bit further away, that I don’t expect it will interfere. I’d swap a mid-week high intensity run with the week-end long run. For example, a Tuesday or Wednesday interval run becomes your 1+ hour run, and your 1+ hour run on Saturday or Sunday becomes that 10K.
Regarding swapping intensity types: absolutely. It’s part of our Level Guarantee and a request can be submitted here https://www.8020endurance.com/contact/
David