Second @gomango's idea of looking for a custom used touring bike; they're out there. Here is my Melton:



Second @SkyDog75's idea of refurbishing an old mtb. There are some issues involved in doing this as they tend to have long top tubes relative to seat height but the components, wheels, etc. are all suitable for touring. Here is one of my favorite all rounders; it gets a lot of use in winter:



And if you can find a B'stone XO series bike, they make great all rounders, gravel bikes, and touring bikes: