Though it is not the absolute final word, a DAR told me today that it currently impossible to convert an Experimental Glider Racing/Exhibition air-worthiness to E-LSA (Experimental LSA).

I was interested in doing this because an owner can obtain a 'repairman' rating (after taking a 16 hour course) for an E-LSA (even if it was not home-built). Repairman seems to be a good match to what I would like to be able to do legally with my glider without supervision.