I don't know the plans with TALOS II, but those who are interested in what happened to the original Talos Secure Workstation crowdfunding might be interested in the following article, which I think anybody, who is interested in how an alternative could look like, should read:
> https://www.crowdsupply.com/raptor-computing-systems/talos-s...
Re:AMD has no plans to release PSP code
by em3rgent0rdr on Wednesday July 19, 2017 @10:54AM
(#14804698)
You can also use C201 arm Chromebook with libreboot (I do) to avoid concerns about a management engine.
[1] http://raptorcs.com/TALOSII/prerelease.php