Why not allow single-wides. They are still of a substantial size and weight but they flex better and do not hit as hard. I did not start fencing to receive blows that wound. Cuts, broken bones and large bruises are unacceptable to me. Saber blades are too easily broken because they are stiff.
Daggers are another issue.
Using broken or cut down epees are fine but why not real flexible dagger blades. They are available from American Fencing in San Francisco. From Larry Stachniak, Greenville SC I have some comments on your quarterly question concerning fencing. Depending on the weapons involved, and the rules and protective clothing, this risk can vary a great deal. The greatest risk is probably assumed by those few who practice jousting with lances at a gallop on horseback.