GEEE - why didn't THEY think of that?
Duh - because it cannot be done.
He wouldn't even have needed to install new electors. He could have just rejected Florida's electors as unlawfully appointed on the grounds that the Supreme Court unlawfully usurped the Florida election--the position Democrats were already taking and have taken to this day. Then he would have won 266-246 with a majority of the "electors appointed." No need to replace the Florida electors.
But he didn't. Instead, he gaveled down members of his own party in the House when they rose to object to the Florida votes because they did not have a Senator. In other words, he followed the Electoral Count Act like every other Vice Present or President pro tem for the last 130 years.