Welcome! Great place to be to get all the info you need!
ZL1 is actually faster than a Hellcat 1/4 mile. Albeit extremely close and it is a drivers ability after all. Hellcat on an open road is very comfortable but so is the ZL1 thanks to MRC but the weight difference does make you seem like the Hellcat is just a tad more comfortable. You can easily DD a ZL1 just as you DD a hellcat. But one thing is that you have the Charger hellcat which is just a FANTASTIC sedan. If only Chevy made a 4 door sedan with LT4 in it and didn't cost 100k but costed 65-70k (aka not a ctsv) which I have told them many times! I would totally buy an alpha platform Chevy SS with LT4 in it. Things about the ZL1 you got to understand is that, it is a coupe, it is fast on straights AND curves. They do call it "Tripple Threat" because of that and it really does accomplish it's job. You can DD it, you can take it to a real track and you can hit up the drag strip as well then just drive home, comfortably.
You mention EvoX, i know exactly what you are talking about as I had 2 evo x's. GSR and MRT. Also have modded the hell out of them (except built block). The tiny gas tank, rough ride (had bilstein shocks with eibach pro kit on both), 5 speed, ride quality and noise was just horrid when it came to road trips.
To me, it really sounds like that the ZL1 1LE is NOT for you but a ZL1 with A10 is. 1LE is NOT made for DD purposes in mind, can you do it? Well yeah. You can DD ANY car, it does have wheels and tires after all. The real question is, do you WANT to? That, for me is a... Hell no. 1LE is a TRACK PACK. Going from a Charger Hellcat to a ZL1 1LE, you will definitely regret it (if you decide to DD). When it comes to the fun of it, ZL1 is a bit more fun purely because of the speeds you can actually corner with AND have a stupid amount of power coming in and out of them. Even for the non 1LE ZL1. Just comparing my Evo X that had fully suspension upgrades (sway bars, springs, shocks, brakes, the whole deal) my stock 2SS with MRC out performs it even in tour mode, let alone sport or track mode.
As for space... Charger Hellcat has a crap load more space. Can't even compare it to a Camaro. Coupe vs Sedan alone... The back seats of the camaro are for baby seats and backpacks and for insurance reasons. Not for any adult human being lol. My dogs don't even fit back there... 1 contortionist can fit very well though. As for the trunk, it is very spacious however the trunk opening is laughable. Golf club bags and carry on size luggage fit just fine but an actual decent size hard cover Samsonite will NOT fit in it.
As for your questions:
1: You can buy and install a 1LE wing to a ZL1. It will cost you about 3500 easy.
2: Garnet red is a perfect choice
The canards up front, not entire sure if you can fit them or they actually come WITH a bumper. But worse case, you could literally buy an OEM 1LE ZL1 bumper, paint and slap it on. Parts aren't readily available from the 1LE just yet as they are stockpiling it for customers who actually OWN it first. Wings became available and so did the brake lights but other stuff, not so much. There will be more ZL1 1LE OEM style aftermarkets wings in the works. One is already out by 6LE Design ($1500). I am very certain that ACS composite, Street Scene, RK sport will make one as well.
3: You are not being harsh. If people fail to see that 1LE = Track pack, that's their personal problem. Not yours. 1LE's Will NEVER be as good and as comfortable as a non 1LE on the road. But a non 1LE will NEVER be as good as a 1LE on track. Pros and cons.
Feel free to do some research on here about the ZL1 and ZL1 1LE! Also, while being on the other side of the country, don't let that stop you from contacting Becky @ Michael Bates Chevy in MI (used to be Rodgers Chevy till very recently) whom also sponsors the forums and does ship vehicles to the entire 48 states. It would be EXTREMELY rare that you would be able to find better customer service and knowledge from any other person and place!