Is it possible to send the hint from OPNsense itself?
Yes, to me it sounds like you're already getting a big enough prefix from your ISP (all devices getting a /64), but you'll have to request a bigger prefix from OPNsense. I believe it should give you the options to do this when you set the IPv6 mode to DHCPv6 on OPNsense, but I can't say if your ISP router will handle it.
Also a solution: Use Wayland, it'll probably break other things, and Nvidia support is only just getting there; but it's multi monitor support is amazing, so it should fix that issue. So maybe it's worth a try?
For electron, if ELECTRON_OZONE_PLATFORM_HINT and electron-flags.conf don't work, you can also add --ozone-platform-hint=wayland to the end of Exec in each .desktop file (also works on Chromium, but not CEF AFAIK and sometimes CEF).
There's also --ozone-platform-hint=auto if you find yourself switching between X11 and Wayland.
These should all work without kernel drivers. For example, here's a user space python library for ADS1*15 ADCs, or Nuvoton MS51 IO Expanders. Unless you need very specific timing or require the kernel to know about it, you shouldn't need a kernel driver.
Idk, with I2C if it's not something that needs a kernel level driver, there usually isn't a problem with interacting with it from user space, for example basically all RAM RGB controllers are I2C and OpenRGB has no problem with them. I'm pretty sure I've only ever used an I2C device tree overlay for an RTC.
Also I2C/SMBus is present everywhere on x86, like some graphics cards expose it through their HDMI ports, even some server motherboards have a header for it; but for GPIO I'm unaware of any motherboards that expose it, so good luck researching the chipset and tracing out the pins.
If you can't get the VPS to work, alternatively there's Cloudflare but last I checked streaming was a little out of their free terms. With it, you should just have to set your AAAA record and make the cloud orange, that way Cloudflare will proxy it, and IPv4 will work. There's also Cloudflare tunnels which lets you host websites without port forwarding anything.
Because how can linux ARM run on a device that used to run windows x86?
Have you misread AMD64 as ARM64?
AMD64 is the 64bit extension of x86, often also called x86_64.
As others has said, ARM is a completely different architecture which is not compatible with x86 without translation layers. ARM also has a 64bit version called ARM64 (or AArch64).
then there's definitely the type of water ditching where the plane angles into the water at full speed, and I don't think that's gonna have 80%
Pretty sure last time that happened it was still ~30%, which seems pretty impressive considering the video: https://youtu.be/w1u0D0E-Bq0 (SFW but it is a plane crashing)
I don't think Windows has swap partitions, you could maybe install a basic installer to the recovery partition, repartition in that (copying the ISO between partitions), then load the full ISO.
I don't know anything that can do an in-place ext4 conversation, but there's ntfs2btrfs which is already in the Debian repos if you're okay with BTRFS.
Of course, backup anything important, ntfs2btrfs should create a backup snapshot if you need to revert back to NTFS, but I wouldn't count on it.
Yes, to me it sounds like you're already getting a big enough prefix from your ISP (all devices getting a /64), but you'll have to request a bigger prefix from OPNsense. I believe it should give you the options to do this when you set the IPv6 mode to DHCPv6 on OPNsense, but I can't say if your ISP router will handle it.