A couple notes to help save others a bunch of time and money.
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PS/2 does not work with Heads - despite being the default configuration on this Qubes Certified machine (with an additional charge for a nitrokey).
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RAID does not work with Heads because mdadm is not currently included for size concerns
When contacting Nitrokey for assistance, neither of these facts seemed to be fully recognized by them at first so I spent a bunch of time trying to figure both out. This is a fork of the main Heads project, and it seems there is no plan to address them. And now I am looking at how to build and flash my own firmware to get them working after having paid a premium for a pre-configured machine.
Wasn’t able to find info from other users before purchasing, so hope this is helpful to others.