People have toured everything, on anything.
Around the World on a penny-farthing - sure.
Over the Rockies on a unicycle - yes.
I’ve even read about one guy setting out to visit every state on a bmx, riding backwards.
Compared to that, your idea is perfectly doable.
First off - what kind of touring are you looking to do?
Touring runs the whole range from credit card touring to support cars to self-sustained for days/weeks.
I wouldn’t recommend a stumpjumper for much in the way of unsupported touring.
But it’d work fine for tours closer to the CCT end of the spectrum.
It’s kinda frowned upon, but technically easy to bring the bars further back-and-up by adding a steerer tube extender and a really short DH stem.
While your bars are indeed kinda low, the first thing I’d recommend WRT comfort is to rotate the bars down. In the pic, the ends are pointing up.
Try having the grips horizontal when viewed from the front.
Not many are comfortable with that angle.