The clearance for the headlight is initially what got me interested in the riser version. I wanted about a 40mm rise, but 50 mm should be okay. I'm going to wait a bit and see if I like my stock bars for now. I cut them down because I need them to be a bit more narrow. I am mainly using the bike to commute to work and I don't want super wide bars. My ideal width is about 630mm.
Happy to help out. Just a thought, depending on whether you plan to use a front handlebar bag or not, with the SG2.5 riser version of the HBar you may very well be able to use the original Stromer headlight brackets and attach your light on the back loop at the stem. Without a bag and with the front loop raised up the light might still function fine and not be obstructed in any meaningful way by the front loop.