Sorry, this isn’t helpful. I migrated the hard way, hah. I just went to each page in OneNote and hit ctrl+a, copied that and pasted without formatting into TriliumNext, then fixed the formatting.
It took some time, but was worth it to me. I figured it would be a good test to help me familiarize myself with TriliumNext a little.
An easier path to help adoption would probably go a long way, but it also might eat up a lot of development time and routinely need work. I’m not sure how often the OneNote export formats change.
I’m pretty sure after exploring thousands of people you’re more likely to get chlamydia than rich. I could be wrong though, maybe try it?