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Trump himself called up Republican officials in several states to urge them to participate in the fake elector scheme
I don't think made the calls to which you refer. It was his closest "allies" who made the calls regarding alternate elector slates. Those characters are probably facing close scrutiny for possible violation of state laws and of course on the flip side when they presented the electors to Congress and NA they were attempting to defraud the US government a federal crime. Unfortunately I haven't seen any evidence Trump was directly involved. He is certainly implicated only because he is the principle.

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He told the security people at the Ellipse to turn off the magnetometers that were not allowing armed attendees in to hear his riot incitement, because he wanted them armed.
First, that is hearsay evidence, not corroborated by anyone. While Hutchinson appears to be a credible witness, she is only one witness who offered that testimony. Don't draw the conclusion, "he wanted them armed". He may have been miffed not allowing them in decreased his "crowd size". Can't be savior of America with a "small crowd size".

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he watched it on TV for hours without doing his duty to stop it
That is more indicative of dereliction of duty, which may or may not be a crime.

I believe they need direct evidence of his participation in the plot to overthrow the government. I think it is hard to believe Trump, who would be the only benefactor of the plot, did not know what was going on, so one of the co-conspirators needs to testify Trump was ringleader or willing participant. Because he is a narcissist, he is very easily led by those who know how to lead these people with personality disorders. Putin, Kim, Xi, and Netanyahu all knew how to do it. People like "Kraken Lady", Guiliani, Navarro all knew how to appeal to Trump's narcissism. Al they had to do is sow the seeds of a stolen election, fabricate evidence in the guise of depositions of voter fraud, changing voter regulations which led to votes against Trump, allegations of machine flipping votes to Biden, allegations of bizarre schemes of lasers, watermarks, paper size, foreign servers, software written for dictators, Bayesian analysis of voting patterns, crowd size of rallies, etc. I vehemently wish the J6 Committee had taken each of these claims, and had all the claimants present when they debunked each claim. It would have exposed the claims as incredulous to even the purveyors of the claims.

Without someone from his inner circle testifying, I think it would be hard to convict regarding J6.

ignorance is the enemy
without equality there is no liberty
America can survive bad policy, but not destruction of our Democratic institutions