I have read that they want to use a solution in England to have all games played at Wembley.
That could also be an idea for Italy. But then remains the question how fair this will be, since it must be played without long breaks.
A mini competition or 2x25 minutes would be better, but then you are stick to the rules of the FIFA/UEFA.
No, this shouldn't happen. Especially the mini game format. If and when the conditions allow they need to carry on like they normally would, with the only difference being empty stadiums. But that is the sacrifice they need to take for the safety of everyone.
The teams should be allowed to play the remaining matches on their own grounds, not somewhere abroad or on a neutral venue.
Some other sports have decided to end their seasons prematurely. They wont be continued. European Ice Hockey leagues, for example. They are all finished. What has happened has happened. In some leagues the last match-day standings counted for the final rankings, in others, they will just restart from the next season. No champions, no relegation, nothing.