Ahh interesting.
Well, not sure what to do for historical data, but you have some options moving forward.
You could either create a new set of custom fields in your Marketo instance, and literally just populate them with the same information you'd put into an interesting moment. "Last Activity Desc" for example, and just do a change data value flow step for that field, and change that string field to your new description instead of using the interesting moment fields.
Alternatively, if you want to get these into your CRM too, you could log them as a completed task by the contact. Definitely confirm the volume of interesting moments your team would be posting into the CRM, but by creating these as tasks (and again, the description of the task can be EXACTLY what you were putting in your interesting moment description), your CRM team could filter contacts and leads that fit the description you enter. If you needed to, you could still filter for these in Marketo by using the Activity Was Logged filter, using the date constraints and searching in the Subject field that you'd be populating with your flow steps.
Good luck!
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