I also just thought of this idea too, and came here to see if someone had made a thread suggesting it already, I was surprised to find one so recent. The reason I thought of this was because I wanted to use the Golden Dragon Sword, which looks really nice and gives that 'ijji' experience, but it means I cannot use my donation sword which has better stats.
I think a lot of people would like this to be possible, and I fully support the suggestion.