Hello k5map,
That is a great question! I spent some time tyring to make something work, but I am afraid to have bad news.
First, I have been able to install a debian 12 kernel and boot the RPi Bookworm OS. This was the easy part, and not that much different from what we have been doing with past versions.
I was able to install open-vm-tools, no issue here.
But then RPi OS changed to use Wayfire as the desktop manager, using Wayland. And it requires a (virtual) GPU. The ESXi Arm fling v1.x does not have GPU support, so this will just not work.
Then I tried the same on Fusion Apple Silicon Tech Preview, and it seems that the GPU support has issues. I don't know if it's Debian Bookworm version of vmwgfx module, or from the hypervisor. I'll follow up internally.
But for the fling v1.x, hélas, there is no hope to run RPi Bookworm OS. Sorry for the sad news.