(some spoilers follow)
I love the random mini rewards in Zion, and the more variety the better for immersion and replayability. One possible reward I would like to see is a machine that is a derelict take on the fabricator, allowing you to load schematics for fabrication but without any fail chance or risk of trace/lock out. The balancing factors would be 1) it would necessarily be on -6 or -7, so you won't have the best schematics; 2) give the machine a finite amount of matter so it can only fabricate so much; and 3) you wouldn't get it every game since it would not always spawn.
This unique reward would allow for the one place in the game where you could have risk-free successful fabbing, a nice perk for combat builds without hacking gear. In the event that Data Miner is -7 and Zion is -6, this reward would allow combat builds to put some of DM's rewards to use and would create further synergy between the branches (which again which be an infrequent turn of events, since it would depend upon the ordering of the branches, successfully reaching both, and having the fabricator randomly spawn in Zion).
There is already some precedent for risk free fabbing as a branch reward. Adding the chance to see this machine in Zion would give you a different take on that and could alter how you plan runs and how runs turn out if you get this reward. Finally there's little risk of this being too good of a reward, since you can just tweak how much matter the machine has and can therefore fab.
(Also if the title is too spoilery let me know and I'll change it).