Although a tad expensive ($479 complete) - this parallelogram mount sold by Bintel might be your best option, unless you're handy enough to construct one yourself. The Bintel model certainly looks pretty sturdy - they sent me some more detailed shots a while back when I enquired about one and it looked like it could handle 20x80s no problem.
https://www.bintelshop.com.au/Images/Stock/6624X.jpg
It's in the binoculars section surprisingly!!
Don't go for an EQ5, like Ian says you'll break something!
Doug
ps...congrats on the Bub!!!