I don't think any commission is going to offer enough evidence about the lack of voter fraud to convinced believers in voter fraud. One can always claim the commissions used poor techniques, had political agendas (gave money to a campaign), or were themselves part of a conspiracy by the deep state. 
Part of the problem in using facts to change minds is that some of these people have almost no understanding of statistics. For example, one only needs to randomly sample a little over a 1,000 voters. And while random sampling is sometimes a challenge, it would discover a trend that could be further investigated.
Another problem involves numbers vs. rates. It might be possible to find dozens of illegal votes, but as a percentage of the total the numbers are tiny. Yet people understand say, 47 illegal votes, not .01%.
We should ask why the votes were illegal. Some votes are mistakes. If one has a .01% error rate, 10 million votes would yield 100,000 bad votes. But that never happens.