I think Danny still has some of the classic-encore tweeters (should be the same tweeter you've got). Put that together with your woofers, some skiing ninja networks, and maybe some parts express cabinets, and you could DIY a pair of ninja'ed XLS encores?
Otherwise, you would probably have to check with Danny, but if the woofers are the same as used in the Neo2x kits, new tweeters and networks could get you into a pair of those?