https://www.amazon.com/HDMI-Switch-4K-Splitter-Bi-Directional/dp/B079JQ9XXV/ref=pd_sim_23_1?_encoding=UTF8&pd_rd_i=B079JQ9XXV&pd_rd_r=VE7AN2GX9D7G3NFKAHPA&pd_rd_w=6Z0Fe&pd_rd_wg=aAQAq&psc=1&refRID=VE7AN2GX9D7G3NFKAHPA

This may be what you want. I've used it (not that one, a 4 port switcher) for switching between consoles to my one large HDMI monitor. I don't know if it's Rift compatible with all the power/bandwidth issues though. I'll test mine tomorrow after work and let you know.

Depending on your card, it may be easier/more reliable to get another cable to run from your card to your monitor. I have a 25FT hdmi cable connected to my TV with a HDMI to DisplayPort adapter (as it carries sound vs DVI/VGA) and the two displays coexist happily. The desktop icons shift around when you launch the oculus software as windows detects it as a display.

• Monitor: ASUS VP249

• Laptop: MBP 16" 2019

• Rain mStand Space Gray

• iPad: iPad Pro 2017

• Apple Magic Keyboard

• Apple Magic Trackpad

• PreSonus AudioBox 22VSL

• 3M table stand

• Kensington Wrist Pad

• Bestand for iPhone and Apple Watch

• Amazon Alexa 1st gen

• LynkHUB+ 6 in 1 adapter for MBP (can't seem to find it online)

• HDMI switch, the one I have is not in Amazon US but it works like this one