I think I like that idea best too. Add another set rather than replace. 
Danny, I have watched this with my mind already made up, so I have no dog in the fight. I personally use copper bolts and nuts with the internal cable run to the outside and do the incoming speaker cable/internal wire sandwich thing, so I'm just stubborn in how I want things. I build all of my own cables anyway. The conductor to conductor gas tight pressure (cold) weld is the best connection possible, especially between non-electrolytic metals.
Just an observation from someone that is in the hi-end game, too. If I have a customer that wants a peanut butter and jelly sandwich painted on the front of something he is purchasing for $20K in this economy, I'm gonna ask him creamy or chunky and do it.
I agree with you that the Tube Connectors are the best speaker cable connector that I have seen or used, bar none. Audio wackos (pick me, pick me!!!

) are a strange breed though. If 'twere me (which it isn't obviously) I would make my case for the Tube Connectors, have Serenity offer a free re-termination service for the customer's cable (+ freight, of course) AND also offer the connector of the customer's choice as an option. Everyone wins and the wacko that lives in all of us is satisfied.
One other observation: most audiophiles are not setup or qualified to do a high temperature/high mass cable termination. There are a bunch of us here that do this regularly and think nothing of it. That's good. I have, however, seen quite a few DIY terminations that look like they were done with a knife and fork over the kitchen stove. I had one customer complain to me how his hi-$$$ amp was a POS....
until I re-terminated his cables.
Stirring the kettle again, I guess.........................
Dave