It looks likely that if Corbyn stood aside then the Liberals and Tory rebels, who are also necessary for the proposal, might agree to it. As the interim government will supposedly not be there to implement Labour policy then there's no need for Corbyn to be it's leader as far as I can see. The pressure seems to be on Corbyn as much as the Liberals. Stand aside Corbyn, job's a good 'un.
It seems likely Labour and the SNP will be able to come to a working arrangement in parliament. Caroline Lucas and Sturgeon have both publicly come out and asked Swinson to rethink her rejection of Corbyn's proposal. The pressure right now is entirely on the Lib Dems. The idea that they get to dictate terms to the other parties is ludicrous and shows that the Lib Dems are more committed to stopping Corbyn from ever entering Downing Street than they are removing the Tories and preventing a No Deal Brexit.