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Edit: Also yeah you should be able to dual-boot but I wouldn't recommend it. Linux and Windows bootloaders don't like to play nice with eachother.
2nd Edit: Added the official PVE Hyper-V migration documentation, but that blog covers it in more detail.
3rd Edit: It looks like there are some important caveats when virtualizing TrueNAS, which I assume you're familiar with since you have it virtualized already but I wanted to add the TrueNAS virtualization guide just in case. https://www.truenas.com/blog/yes-you-can-virtualize-freenas/
You should be able to migrate most or all of your existing Hyper-V VMs to Proxmox, which would be relatively straight forward. My recommendation would be backing up everything to your TrueNAS (that has the dedicated HBA) then you can wipe your Windows boot drive and install Proxmox. Then you could start by migrating your TrueNAS VM over and passing it's HBA back to it.
Once you have your NAS working in PVE then you could either migrate/rebuild your other VMs, or look into splitting your services into containers (Proxmox uses LXC natively, but Docker is another option.) There are some great helper scripts to get services spun up quickly so you can minimize downtime.
You didn't mention how much, if any, experience you have with PVE/Debian and I know from a friend recently switching that some things are a bit more "difficult" than TrueNAS so hit me up if you need anything. The PVE admin documents will be helpful as well.
https://pve.proxmox.com/wiki/Advanced_Migration_Techniques_to_Proxmox_VE#HyperV
Yeah I thought about this being the easiest way to do it. I just wasn't sure if TrueNAS would come back up and just recognize the disks and start working. I have backups of everything and I've tested restoral. I would prefer to not have to go the backup restoral route as it's more a scorched earth option. My other VMs I'm not really concerned about, it was mainly the NAS.
I don't really have any experience with PVE, but I want to learn. I've been learning about docker containers more recently, I like learning new tech so I'm all for it. My main PC has been running Linux for about 6 months now and I'm just trying to get away from Microsoft in general. Thanks for the info.
I haven't used TrueNAS but from what I'm reading it has an option to import existing pools. If you have spare SSD I would yank your windows drive out of the system and try installing Proxmox on the spare drive first. There's a truenas installation script on that community page I linked in my other post, it says to follow this discussion after it runs. That might be a good starting point.