Chosen Solution
First of all, you can have your 6 Plus Touch Disease repaired fairly economically. The current best practices offer a very robust repair and many, many micro-solderers offer this service. Secondly, as far as re-purposing the NAND, yes you can in theory but not necessarily in practice. NAND Flash drives change constantly, even if popular models maintain the same case design for years (i.e. Sandisk Cruzer). You would have to find or own a model that uses the exact same line of NAND chips and even then, there’s no guarantee the controller will automatically recognize the larger capacity.
