It would be possible. The method that first comes to mind would be to create custom symbols for each of your icons in the gtol.sym file. There's a tutorial here: http://www.eng-tips.com/faqs.cfm?fid=1229
It's not particularly easy. I don't recall there being any updated/better way of creating symbols.
However, once you create your symbols then you can insert them anywhere you would insert text. Unfortunately, as mentioned in the tutorial, the symbols will not show up on any computer that doesn't have your custom symbols described in its gtol.sym file.