If you can’t handle using “they/them” just use their actual name in the sentence. Not that hard.Can someone please come up with a less confusing pronoun than 'they'? It makes the context of a sentence very confusing. You sentence conveys that Bruce and Kris were one entity combined. WHy not just word the sentence as follows.
I can picture Kris Jenner wearing a strap on and pegging Caitlyn with it when Caitlyn was still Bruce.
Still somewhat confusing of a sentence, especially for a non-native speaker, but much clearer on who is being referred to.
I find English only speaking people to have this problem. Those who know two or more languages can usually understand how to use They/Them properly and more easily