It's a nice thought, but I don't think it will work with this tablet, as
@Feartech says it's not compatible. Not only that I can't see how you would get power to the GPU, have a look at my user build, link below. My GPU connects to the M.2 NGFF E Key slot via a ADT R53SR cable and power comes via a regular SATA connection.
craighazan's Recycled Thin Mini ITX [NAKED] ASUS Prime H310T R2.0 — i5-9600K — RX560/UHD630 Components: New ASUS Prime H310T R2.0 motherboard — Newegg Intel® Core™ i5-9600K 6 Core Processor 3.7GHz (9MB L3 Cache, Boost up to 4.60 GHz) — Newegg | Amazon 8GB (2x4GB) G-Skill DDR4 2400 MHz...
www.tonymacx86.com