Republicans already control enough state Congressional delegations to win a contested election vote in the House of Representatives.
Each state delegation gets only one vote. Dems are concentrated in coastal states. Dems have a majority of representatives but not control of a majority of state delegations.
“2021 House Majority by State”
https://www.270towin.com/2020-house-election/state-by-state/consensus-2020-house-forecast
“The Constitution and contested presidential elections”
https://constitutioncenter.org/blog/the-constitution-and-contested-presidential-elections