Is there any quest that have you choose between rewards? I been looking through files trying to find an example of this.
The easiest way to do this is through a Vending Machine mechanic. Have quest give you special tokens you redeem at a vending machine to choose what reward you want.
I mean you could do a pick a choice but that would require making a custom Lua Dialog box which I am just not good at. If you are good at Lua I suggest checking out Script Canvas \ Widget https://starbounder.org/Modding:Lua/Tables/ScriptCanvas
I'm a total lua noob. I can kind of cut/paste to "glue" together stuff and make what I need. But I already got the crafting station/unique reward senerio worked up. It works fine.