I'm 99.99999999% sure Joe Biden/Kamala Harris will be on the ballot as Democrats in Ohio but should the Republican SOS and Legislature play games Biden Harris could run as Independents with 5,000 signatures by August 7th.
This would certainly result in the highest number of counties a third-party candidate has won since 1992 (Perot won 15 counties nationwide in 1992 (not consequential at all, of course, but interesting factoid).
Since we are already in fantasy land Democrats could just have fun with it and run an "Independent" ticket of Tim Ryan/Lebron James.