If you think that it's cheaper to just buy the new model than to custom-assemble/redesign your own based on a CT70, you're fooling yourself. Apples-to-apples, fielding a comfortable, competent, road machine has a minimum price of admission, regardless of model...and that gap between the MSX & CT, taken to a comparable standard, is small. Then there's the dealership/finance and insurance industries to deal with, all of whom want to bend you over. Nope, only good reason to buy a Grom is because it's what you want.
I say buy a used Grom as there are hundreds of low mileage examples available. I've seen some great deals on these bikes that are still like new. Modified CT70's to the point of a grom have no real value to anyone but the owner. Once you start investing that much into a Honda CT70 you start seeing a hell of a lot better value in most any other form of transportation. Now fun value is measured on a completely different scale.
Milk crate? Lol! Yep, red or yellow are my choices too.I'd add a luggage rack with a milk crate for that old school CT90 look and probably call it done. And get a red bike or maybe yellow.