Seems to me that, if you were to refine your policy to waive the fee in the case of a conversion to a contribution, the entire amount could then be a gift.
My US$0.02 worth; the usual disclaimers apply.
Alan S. Hejnal
Data Quality Manager
Smithsonian Institution - Office of Advancement
600 Maryland Ave SW Ste 600E
PO Box 37012, MRC 527
Washington, DC 20013-7012
Voice: 202-633-8754 | Email: HejnalA@si.edu