I know many will probably make inaccurate assumptions about me after asking this question
People are going to assume you're a premed who knows nothing about the practice of medicine, but...
You can double board certify in anything. The biggest obstacle (outside of money, time, and practice considerations) would probably be getting a residency program to accept you after you had already completed one. Also, even if you were a literal god-tier med student/resident, you'd probably be looking at 10 years of training after med school graduation.
The problem with doing this is that it's pretty hard to practice two specialties at once. Even the people who go into true double-boarded residencies, like IM/psych or EM/IM, basically practice one specialty with the other "contributing" a bit. Thus, when you see someone who's already boarded doing a residency, it's usually because they're trying to switch.
There are niche dual-specialty residencies out there in a similar vein as what you're describing (e.g. neuropsychiatry) but they are rare, very narrow in focus, and, as far as I know, never combine surgical and non-surgical specialties.
If you're actually a premed, I would suggest shadowing both specialties. They aren't as similar as you might think.