Does OPNsense work with Ventoy ?
I am not sure anymore, but considering the fact that I have a seperate USB Stick on which OPNsense has been written via DD in Linux I guess that's the way to go if you want to be 100% sure that it will boot :)
The procedure written here : https://docs.opnsense.org/manual/install.html#installation-media
Is similar to what I did, so just follow those instructions if you are on Linux/*BSD/MacOS/etc...
!! Make sure you pick the right image to start with : https://docs.opnsense.org/manual/install.html#installation-images !!
when I tried a few months ago, it didn't. It started to boot, then crashed before the user prompt on the console.