UPDATE: Great news! Thanks to a community tip in the replies(thank you @pink ), I reached out to the vendors directly.
I am happy to report that @nitrokey and @yubico have both approved review units for the channel! 🎉
Transparency Note: Since I no longer need to buy the hardware, I am changing the Ko-Fi goal.
All funds will now go toward an Overhead Camera Rig & Desk Mat. This will allow me to film stable, top-down "hands-on" shots for the upcoming reviews, so you can actually see the hardware in action.
Thank you to everyone who boosted—you saved the channel money and upgraded the studio!