Notice how unhappy the Associated Press Journalists are with this. They call this action an attempt to "subvert the democratic process". If a court were to declare the election null and void then the Legislature would have to choose the Presidential Electors without the guidance of the election. This is a feature of the electoral process and not a bug. Hence, there is no subversion.

https://apnews.com/article/trump-invites-michigan-gop-white-house-6ab95edd3373ecc9607381175d6f3328