For those with no printers, here's Etsy link with all the necessary hardware.

This model is a plug for the 2nd row armrest from KIA EV9 captains chairs.

I found these armrests unnecessary and only narrowing the walkthrough space to the third row.

The procedure is comoletely reversible and leaves no trace of it ever being there.

With this modification the space between 2nd row seats doubles from 6.5" to almost 12" and your 3rd row guests will appreciate the ease of ingress.