Except that if he really hopes to see Bernie on the ballot then it’s getting very late in terms of ballot access deadlines. According to this site, 20 states will pass their deadlines by early Sept. and most states will pass their deadlines by late Sept:
https://ballotpedia.org/Ballot_access_for_presidential_candidates
However, the site does indicate that courts and state election officials have shown a lot of flexibility on the subject of ballot deadlines in the past.
Ballot access deadlines don’t really matter for Democrats.