You could spend a lot of time looking for the "right" tourer when you could easily just get a "right" hybrid for the job. The web is littered with hardly used hybrids bought by people intending to ride/lose weight and then giving up very quickly, there are great bargains to be had and little risk in bikes with so few miles under their wheels.
I've posted this many times before...............my tourer was stolen just before I set off on 1000 mile tour of Spain, I bought a 3 month old Specialized Sirrus for £200 from a local guy and with only a change of tyres flew out to Bilbao a few days later. It was just fine and when I returned I put it on Ebay where it sold for £365.
Specialized Sirrus, Trek FX, Dawes Discovery, I'd happily do your trip on any one of those. Get the right size for you, stick some bar ends and rack on it and off you go...........
I have both steel & aluminium hybrids at the mo' and wouldn't really have a preference as to which to take on my next tour.