No matter how close Liverpool have come to winning it, you cannot award a competition to a team that has not actually won it, as that then sets a precedent for locking in every other position in the league pyramid.
The way I see it, the only actual obligations we have are to provide European spots, and UEFA will likely default to their own rankings to decide them anyway. Perhaps any team still remaining in a competition could be awarded a spot for next season if they wouldn't otherwise qualify.
Liverpool are the only team to have mathematically secured themselves a CL spot for next season, so that's the only thing we can lock in from this season's results.
No promotions. No relegations.
If next season has to be delayed a bit, scrap the League Cup, and possibly even the FA Cup depending on how long the delay is.
You are missing the point though. After 28/29 games the only thing in the league that looks 100% certain is that Liverpool will win it because they are so far clear.
There is no realistic argument that can be made to suggest that Liverpool wouldn't win the league now and you know it!
Everything else is up for debate. Its very close in the top four race and for relegation.
As far as I am concerned the best option is to wait until it is safe to start playing matches again (even if behind closed doors) and finish the season, however long it takes. Even if it causes a delay to the start of next season.
It's not highly realistic, but given your recent form, it's not completely impossible that you did the ultimate bottle job. You've gone from being on course for a Treble winning, unbeaten season, to being convincingly knocked out of the FA Cup by Chelsea, tonked by Watford, and losing both legs of your CL tie against Atletico to be turfed out of that too.
Your last four victories have all been by a single goal, and came via a late own-goal against League One Shrewsbury in an FA Cup replay, a late goal against a relegation scrapping Norwich, a late goal to come from behind against a relegation scrapping West Ham, and coming from behind against a relegation scrapping Bournemouth.
Your next game would have been against Everton, and I don't need to tell you how much they'd be up for at least delaying your title celebrations. After that you were supposed to have City, who again, are more than capable of beating you. That takes you from needing two wins in nine to two wins in seven, having lost three of your last four Premier League games. Your run in would then include Chelsea and Arsenal still fighting for Champions League places, and Brighton, Aston Villa and Newcastle who are all fighting to stay up. Hell, even Burnley and Crystal Palace would't be easy fixtures, with both equally as likely to steal a European spot as they are to get sucked into the relegation fight.