There are a few options:

Dual in wall zwave switch https://www.amazon.com/ENERWAVE-NEUTRAL-REQUIRED-ZWN-RSM2-PLUS-Version/dp/B07KQMGH7X

PoE https://www.amazon.com/UCTRONICS-Raspberry-Ethernet-Chromecast-Compliant/dp/B0876N3PMZ

any Qi will work.

Note you can use either PoE OR the makesbymike microUSB (or USB C if a newer FireHD) power adapter. Depends if you want to remove the device from the wall or leave it there.

Look at the dimensions of the 3 gang WiFi switch you linked to. It’s the same size as that 3 gang plate I linked. It’s 4.7” wide, or the same as 3 switches wide.

I don’t know of any 3 switch, single gang zwave device. You could do micro switches and use your regular 3 switch but you would have to find somewhere for the switches, possibly in the light fixture. They take an input from a regular switch to toggle on/off. Something like this. https://www.amazon.com/dp/B07KQMGH7X/ref=cm_sw_em_r_mt_dp_865FHPPV22MV091JX1Z2 or an aeotec nano. There are several out there.

Or you can replaced the box with a larger one. I’ve done this where our builder used a single gang switch for both fan and light. I just cut a bigger hole in the wall, removed the single gang box, and replaced with an old work two gang box and then used two zwave switches.

The only switch I have ever seen that can even do two in one gang box is the Zooz switch that has a light dimmer, and a switched relay too. Unfortunately, my Vera doesn’t have it as an integrated device and support had to put in work around to kinda make it function.