Again, you cannot Impeach the President as "A President", and then Trial him on those charges as a private citizen.
Just as you assert the former "language", thus "language" also fails the charge: the Constitution does not make private citizens subject to Impeachment.
And note Belknap's post-resignation trial is inapplicable here. (A) Trump did not resign, God bless him; and (B) Trump has what Belknap never had - presidential immunity.
Not only is Roberts going to have to rule on his absence, Queeg will be forced to address a seperate suit asserting that presidential immunity absolves him from the civil actions undertaken by others, and Roberts will be forced to address a case that will be dog-eared with references to Nixon v. Fitzgerald and Clinton v. Jones.
Thus Trump will remind us all that a living President, rather than having been tried and convicted after Office, was instead "alternatively sanctioned":
Klink's perjury (in Office) and suborning perjury (in Office) failed removal, yet this ridiculous banana court insipidity by Madame Defarge arises from a speech where Trump said, "Our country has had enough. We will not take it any more and that’s what this is all about. To use a favourite term that all of you people really came up with, we will stop the steal.". That's it. It's all about one crazy fucking old lady mad-ass butt-hurt than a dude put her muddy boots on her desk.
My advice to Trump is hire Dersh, hire Turley, but go all-in -- make it all about Pelosi and Schumer, drag Klink into it, drag Roberts into it, drag Karamela into it.
Rand Paul Drops NUKE on Dems’ Plans for Second Impeachment
https://www.youtube.com/watch?v=wxIwsd5wtwk