Always a fan of the simplest solution; plus at $10-12 per injector often enough for used "refurbs" on many cars that makes a 4 cylinder under 50 bucks to convert and no extra boxes or wires under the hood.
But what if the E85 kits do something more than just add reverb?
If there is a logic function that scales the reverb with engine RPM or if it has some cold enrichment routine or something, those wouldn't be addressed by changing injectors.
For what it's worth I've had two cars on E85 kits from FuelFlex and they worked awesome with
no drawbacks, but now I have a new little daily driver and figured I would start researching other approaches.