If you want something more akin to private email, that is possible you just need a difference license. https://www.fcc.gov/wireless/bureau-divisions/mobility-divis...
I have frequency allocations (well technically a radio shop manages them for us) and use AES128 encryption with no issues.
Forming a corporate entity and paying the frequency coordination fees are going to be minimal in comparison to the hardware costs to communicate at a distance (encrypted or clear) reliably.
The first words on that pages are "Individuals or entities desiring to […]".
You, as an individual, can get a license. It's probably just more common for legal persons [1] to go through the effort rather than natural persons [2].
Still, will explore this.
If anyone has any tips for encrypted voice comms using this path I would welcome it
You do not have a right to use common space (e.g., radio spectrum) without regard to the rest of society. If are given permission to use a common space, you have to use it with the stated conditions.
Privacy is a human right, and that applies over radio.
If I need to register my public keys like a license plate, fine, but the content is only the business of the recipient.