Sorry, Ventoy can't work as an ISO image.
I don't know whether IODD can boot a 1:1 image of Ventoy USB disk. I can do a research if I have time.
Have you tried use dd to generate a 1:1 disk image of Ventoy USB and rename it to xxx.RMD and boot with IODD?
As the bitcoin, this is my address: 19mZDWzZgzkHCi9YX9H3fYCUuCHq3W6wfT
I don't know whether IODD can boot a 1:1 image of Ventoy USB disk. I can do a research if I have time.
Have you tried use dd to generate a 1:1 disk image of Ventoy USB and rename it to xxx.RMD and boot with IODD?
As the bitcoin, this is my address: 19mZDWzZgzkHCi9YX9H3fYCUuCHq3W6wfT