We also have our combo here:
https://www.xero-limit.com/ecutek-bl...l-package.html
With that pricing you're right there at the cost of an OFT+flex fuel kit, but get all the advanced features and custom tuning you get with EcuTek.
Otherwise there's been no issues running e85 from our end since we've been doing it in 2013, I wouldn't fear it!