I hear you Tavia. I finally was able to afford my DSLR last month! It's entry level but I did pay a little more and get what is called a travel kit lens (Canon EOS Rebel T6i DSLR Camera with 18-135mm Lens) just so I had a little more flexibility. It doesn't have 4K either, just HD.
Cameras and lenses are another area of life where you make so many trade offs and compromises. No one lens or camera does it all.
I saw that same problem you had at the zoo when I was in Kenya in 2011. Some of us were snapping away at the elephants, lions, and giraffes with our compact zooms (mine is 16x) while "Bob" was switching out lenses on his DSLR.
I've seen pros carry two cameras on a body harness for I assume similar reasons (don't know if harness is the correct term) just like you are talking about with you and your husband.
Let us know what you get when you get it! I appreciate your modesty, but you regularly capture snake pics that are stunning. I know good when I see it.
Sorry, I didn't mean to hijack Rich's video thread, but I have enjoyed the conversation nonetheless!