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 Maybe I'm wrong, but an asic cannot be programmed to do anything else. BIP32 derivation is different compared to bitcoin mining. 
 You are possibly right. But who knows... maybe there is a way...  
 But it should be doable to extend Rana with this.

https://github.com/grunch/rana 
 Definitely intriguing, has anyone tried with a GPU farm? There are some services that let you rent them.