Donno what a "unisteer" is?
The WCF kit is your basic Vue/Equinox steering box with a custom bracket and various shaft mods to make it fit the Fiero. It's not cheap, but it basically bolts right up and requires no welding or fab work. It works well enough as long as you're willing to do minor tweaking (and are willing to deal with Chris' idiosyncracies, particularly in shipping delays and ...unique ... phone manner.)
For the brave and enterprising, the basic parts are also available from
https://www.epowersteering.com/ -- as with the Dutch site, not vehicle-specific and will require fab work.
I don't regret going to power steering per se, but (1) it will expose any issues in your current setup, worn components and such that you may not have noticed before and (2) you really need to leave it turned all the way down. Otherwise going around tight corners you can end up spinning out, putting your car in a ditch and whacking a fence. Hypothetically speaking, of course; this has not happened to me (rolls eyes.)
-- A
[This message has been edited by dremu (edited 04-25-2019).]