Richard, there is no digital camera with a waist-level finder, unless you go medium format (which is very expensive) or a custom setup. All modern digital cameras have LCDs though, which you can buy an LCD loupe or shade for. All DSLRs and mirrorless cameras can manually focus, so that's not an issue. In fact, mirrorless cameras have focus peaking for assisting during manual focusing, making it very easy to achieve perfect focus.
If you haven't shot with a DSLR or a mirrorless camera yet, I would recommend to rent one and see how it works out for your landscape photography needs.