Tiger Sport Tiger 850 Sport: Handlebar Diameter? Bar Riser Suggestions?

I love my new 850 Sport and having a blast with this engine. It's my first ADV and I'm really glad to have made a switch from a cruiser.

My sole complaint is that I find myself leaning forward onto the handlebars (that is, putting my weight on the grips) more than I'd like. I've been told that it's not unusual when you're on the taller side (6' even), and that some bar risers will allow me to be in a more comfortable upright position.

First: does anyone know the diameter of these 850/900 OEM handlebars? I can't seem to find it listed anywhere; Triumph only lists the handlebar span/width but not the diameter.

Second, any suggestions for decent bar risers that are easy to install and don't require messing with the cables and controls? And has anyone had the same ergonomic issue that you solved with risers?