Adding Instance Parameters or Dynamic Text to Keynote Families

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I'm developing an improved keynote family and am struggling with the highly restrained functionality of the keynotes. What I want to do seems simple:
Create a dynamic text field adjacent to the key in the keynote family, one which I can edit within the viewport for purposes of clarifying what the keynote references. Note that this is NOT the keynote label text, but an editable field that is blank by default and which has no effect on other instances of the same keynote. It will be filled with things like "typ, sim, beyond, etc".
I would like this to be part of the keynote family rather than grouped text, but am increasingly considering workarounds. I have also attempted to make an instance parameter to toggle the visibility of text in the keynote family, but find that the parameter doesn't appear in the properties browser.
Am I confused? Expecting too much from keynotes?