A block or intake heater would be massive overkill for me, I live in Australia and temperatures where I am at the absolute extreme only get down to 0 deg C. I don't think any vehicle in Australia would ever even have anything like this.
It is more fuel I need to fire up when cold on E85: I've tried RusellE46's fork which blends fuel & ignition tables for flex fuel and also adds secondary tables for priming, cranking and ASE and found it worked beautifully being able to add massive pulse on E85 and set cranking fuel to something stupid like 1000% which gets it fired up almost instantly. My other car likes 1400% cranking enrichment on E85 at 10 degrees celcius and below
RussellE46's custom fork kills operation of my VVT though making it do weird things, so I'm back on master for now and just regular unleaded fuel. Also need some sort of added fueling on high ethanol blends for acceleration enrichment, 255% accel enrichment is nowhere near enough when cold on E85, and a secondary AE table would be nice for using with flex fuel.