I'll keep an eye out for any such beasties...  
Given that BitCoin XT is a direct clone of the Core wallet you can push a transaction yourself.  (See my first post)

OTOH, BitCoinCash is a scale-able block concept, I'm guessing most punters will dial their "Pay only the minimum transaction fee" down to the bare minimum of 0.00001000 BCC/BCH per Kbyte as that BitCoin clone will probably sweep up all transactions and just grow the block size, so there won't be any real need to pay a little bit extra to get into the next block as the block will just keep growing to accommodate all transactions...  QED.

Unless I'm mistaken?