I’d rather that this follow the “Design Tool” methodology, and use the built in templating HubSpot already offers for the rest of the system. This ways themes can be extended, CSS matched, and efforts lessened.
The request itself is definitely a nice ask. Any way we can get it, we need to be able to modify stuff. I hate that we have a serif font for the main text, when we use a sans serif (Roboto) font everywhere else on our site.