Moving imported hatches from Rhino 6 to Rhino 7

I have a pretty large list of imported hatches in Rhino 6 I’d like to move to Rhino 7. Is there an easy way to do this?

Hatch patterns, like linetype patterns, are stored in the 3dm files in V6 and V7.
Maybe you created a V6 Template file with the patterns you used?
Import those patterns from a V6 file that has them into a clean V7 file, and save it as a Template.
Then use it when you start new models.