Then I've finally got a solution for you! :)
I've made a new tool which allows you to search available image resources in AX 2012. The idea is that it traverses all form nodes and menu items for elements with icons and stores the icon resource id, label and help text. This is saved in a table, so it only needs to be done once.
When presenting this on a form, you can search for images using a text query!
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