Jekyll: How can I override (?) page created from data with a user-generated page?

Question

Short version: is there a method/approach to overriding (for lack of a better term?) pages that I've created from a data file using the jekyll-datapage_gen plugin with a manually created page?

Longer version:

I'm playing with Jekyll to create a site that tracks the mountains I want to climb. I have two yaml files right now from which I'm generating my site content:

1. checklists.yml: a list of lists of peaks (e.g. county high points, wilderness area high points, etc.)
2. peaks.yml: a list of all the peaks with their associated metadata (e.g. elevation, prominence, isolation, etc.). I also have a "complete" column where

Right now, I've got a page with a list of my checklists at www.example.com/checklists. Then I'm using jekyll-datapage_gen to autogenerate pages for each individual checklist at www.example.com/checklists/foo_list and each individual peak on the checklist at www.example.com/peaks/foo_peak. So far so good.

As I actually hike some of these peaks, I want to write a trip report on the experience, add some photos, etc. Is there a way to "override" the page I generated above at www.example.com/peaks/foo_peak with my own content, and still have it display at www.example.com/peaks/foo_peak without trying to cram in all my blog content into the yaml file? I could write a script that creates the individual pages at /peaks/ for me, but that also seems messy (and error-prone). Is there a way to achieve what I'm attempting to do within Jekyll itself?