think about it,
I would use the adapters I showed above, however, if willing to modify them:
Skinny spades are less metal to begin with.
making both sides narrow is the same amount of metal left as just cutting one leg off. But, the remaining spade is strong. I have used skinny bladed spades, because I thought it was better than bare wire, on vintage McIntosh terminals, and they can and some have snapped off.
Look at the back of his speakers, the terminal strip is very much like the Vintage Terminals, they come with dividers between each fastener, to prevent rotation, and adjacent contact, that is already solved.
Don’t forget, in addition to the remaining leg of the spade, you do get some contact area from the metal just below the spade’s leg, your terminals let you shove them all the way up, the top of the spade does not restrict that. If it did, you just cut it shorter, to get more ’bottom’ contact.