Tablet [Q] Turning a 4G Xoom to a Wifi Xoom

I have a 4G LTE Xoom that was on Verizon. I recently upgraded (now I have a Galaxy Note 10.1 2014 Edition), and my parents are buying my Xoom for use around the house on Wifi.

My question is: Can I just flash a Wifi Rom? Or will that mess up other things? Also, can/should I remove the LTE SIM card?