Thats a good reason. Space is the only reason im not driving and FRS/BRZ/86 at the moment.
And the main reason I thought about the Si was for the Manual. You typically get a bit more power, lsd, & and manual. But compared to the Touring you'll give up some amenities.
https://www.collegehillshonda.com/category/11thgen-honda-civic-sedan-accessories.html
I can check tomorrow if these prices include installation or not but it looks like for the rear spoiler, front & side lips you're at $700-800. Not bad.
Btw your render is ???