No problem!

Ideally, on-site local crew and a portable kit, preferably two sets in case of issues. Usually a small prod switcher, lenovo tiny (or hp/dell, we just use Lenovo mostly), and a small audio mixer, with wired mics rather than wireless, like an SM7B or an ev re-20. It’s basically a mini version of the same kit used for the main session. Backup machine though is a laptop rather than another PC if it’s only one kit.

If there is no one going on site to the remote participant, there’s a session before hand to set it up (a week if possible), a session to test with them and get them comfortable (a few days before), and a session a few hours before the main event start to make sure they are all set.

Edit: Stupid autocorrect

Btw, the short answer on this is don’t expect zoom to be more than it is - conferencing/webinar software. For production quality, do it outside zoom so you’re feeding it what you want, and not relying on their interpretation of what good video production looks like.

Because let’s be honest here, they suck at that. As does Microsoft. None of them understand the needs, so it’s best to assume they never will.