After thinking about this for awhile, my plan is as follows:
Export all of my Aperture originals to an external drive
Export all of my Aperture versions as high res JPEGs to the same drive
Put an Aperture vault on the same drive
Put the drive away in a safe place to hopefully never be touched again
Use Photos to convert Aperture library
FRom now on I will use Lightroom for every photo I take
Iwill use Photos to do everything with the old photos and if I need to make an edit that is beyond its capabilities then I will use an external editor
The downside is that I will have 2 separate libraries but if that becomes a problem then I suppose I can export all the photos to Lightroom using one of the export options.
Does anyone see a downside to this solution?