Spades and Cabasse speaker terminals

This question is similar to one posed in another thread, but the difference is significant (or so I think). My problem is this:

I have a pair of older (1985) Cabasse speakers that have fairly sizable post-type terminals. I guess the idea was to simply use bare wire, which is what I'm using now (some cheap Synergistic Research cable), or huge spades. The terminals have a nut that screws off. The nut has a square peg in it that slides into a groove in the binding post. That way, I guess, the nut and this peg thing screw down on the wire, which is placed in the groove (make sense?).

I am wanting to try out some other (used) speaker cables (Analysis Plus Oval 9, Acoustic Zen Satori, etc.), but the spades on these, even the seemingly huge spades on the Oval 9, are too small for the Cabasse.

So, what are my options? The Cabasse are not fitted for banana plugs, so that's out.

If I must go bare wire at the speaker end, can I (gulp) cut off the spades? This does not seem to be an option with Oval 9, because the cable is more or less a braided, flat ribbon. No way to get that mutha' around a binding post!

I'm not a DIY'er, so performing surgery on the cables to install larger spades is not my forte.

Any suggestions would be welcome. Thanks!