Hide/Show different radio button options

[Jake Jollimore]

I'm using Jira 7.9.2, and also have Scriptrunner 5.3.26

We have a custom radio button field called 'Review Status'. For most issues, we want to display options A, B, C and D, but for issues with parents who have certain criteria, we only want to show options A and E.

Ideally, I'd like to write a script that will analyze each issue's parent when they're accessed and Hide/Show the relevant options, or at least disable them. Is this possible? I can't find a good starting place in any of the documentation I've found. I'm quite comfortable with groovy. 

My second, though much less ideal approach (because it will cause additional rework in existing automation scripts), is to have two separate fields: one containing values A, B, C, and D, and the other containing A and E, and just hiding/showing the whole field based on the same criteria.

Any help is much appreciated!