Since you asked, my layman's strategy would be to keep prioritizing the groups at most risk of negative consequences to get the mRNA vaccines and open a second

Since you asked, my layman's strategy would be to keep prioritizing the groups at most risk of negative consequences to get the mRNA vaccines and open a second "lane" with less stringent requirements to get a shot of the J&J vaccine. So right now where I live, healthcare workers and people 65+ can get the vaccine and it looks like it'll be another month before they add more eligibility. Perhaps you would open up another lane to say, frontline workers (retail, teachers, etc.) so they can get the J&J vaccine right now or wait until the eligibility for the mRNA vaccine gets relaxed to them. Upside is this gets the most at-risk individuals access to significant protection the quickest. Downside is that forego "really good" protection for "amazing" protection and get sick while they're waiting.