What does it have currently? i presume a basic Sturmey Archer system (3/5spd) or the Shimano Nexus equivilant. If you did not want to spend a fortune you could always adjust the gearing accordingly perhaps lower if if you are struggling or raise it a few teeth to give you abit more of a...
It does yeah the hub is around the £1000 mark alone, but as bomb proof as anything. Touring it would be a definate, i rode it on a folder and found it ok, but given you have a decent load on the bike then it actually you may well find it pretty useful all round. if not the Shimano Alfine 11spd...
Not day to day, but at previous shop sold the Dahon n360 which used the hub, i thought it was ok, given the choice i would go for a rohloff, found the nuvinci ok but not as good as the rohloff.
what riding you looking at doing?
Right, it all depends on the system to which the handle bars attach to the stem.
There are two ways effectively, firstly a quill stem which you would need to replace, if is currently at the highest position.
The other is an A-Head system for which you can purchase stem raisers for (roughly...