There are webcams that can be slung to hang in the center of a computer monitor, and there are mirror devices that do the same. If the monitor is large and the subject can sit a bit farther back, it’s easier. Also, teleprompter rigs are insanely inexpensive today; you could easily build one that’s tablet-based or phone-based, and make it something that’s mailable and easy to set-up at the guest end.
You can build or print a webcam mount that hangs center-screen.
I’m also getting occasional facebook ads for a fly-away remote system for very high end interviews that’s like a gigantic jack-in-the box: you plug it into AC power, the remote PTZ camera with prompter deploys, you connect a lav mic and bam. It even has built in soft lighting. and IFB connections. Expensive; you use this to interview movie stars and heads of state type deals. I didn’t retain much else about it, in much the same way I don’t keep a tight tally on various aspects of billion-dollar super-yacht interiors; Never gonna see one.
But maybe the simplest way to go is: you don’t send video to the Skype type interview subject at all, or if you do, it’s a still graphic with an arrow pointing up to the webcam, as a reminder.