Help with the field INTERNAL id and SCRIPT id conundrum?

I've just made an attempt to move configuration data that I would normally hardcode (bad!) or store as JSON in a script parameter to a configuration Custom Record. The record defines several Custom Fields that have relationships. What I mean is, the custom record has a couple fields that are List/Record of Field. The problem I have is that when you access those fields from SuiteScript you get the [numerical] internal id with nlobjRecord.getFieldValue() or the field Name with nlobjRecord.getFieldText(). What you don't get is the SCRIPT id (e.g. 'custentity_somegreatwonder'). This is bad news because all of the field APIs