I converted a hybrid with a hub gear to an ebike using a front hub kit. It has been an effective tool for no sweat commuting and for helping pulling loads in a trailer or panniers full of shopping up the hills round here. I had a carbon fork so obviously that had to be changed, so I got a steel canti/disc fork from Bankrupt Bike Parts, and fitted a TRP Spyre front brake, but my frame uses 1 1/8" forks and has a noticeable strengthening gusset around the headtube/downtube joint. Brake levers are Tektro RL340s and work very well with the Spyre, and I am pretty sure they would fit on your 22.2mm bars, just need to be screwed down more.
However much of what Brucey says rings true for me, if it was not so hilly the electric assist would not be all that helpful to be honest and there are penalties to pay in terms of a big increase in the bike's weight, it is an unwieldy lump to lift even without the battery, the front hub's unsprung weight is noticeable along with the stiffer fork, but running a size bigger tyre has helped. Also I have had quite a few issues with damp getting into the electrics, the Chinese made components don't seem very well sealed at all, and if the bike loses the electric assist it is indeed a very slow, heavy thing to ride, you can feel quite noticeable drag from the motor when it is not running. In hilly Cornwall my range is more like 20 miles on a full charge with a 10.5Ah battery.
Also I did not drill a third hole in the down tube, I adapted the battery holder to fit the two bottle cage mounts properly instead. A rear hub is probably preferable in some ways but you would have to change to derailleur gears for that, a mid motor kit is quite a lot more expensive and may cause damage to your hub gear as it was not designed for the extra torque. There is a new uprated Nexus 7 for ebikes and most people agree that all the Nexus and Alfine 8 hubs are OK with mid drive.
One more thing- I also fitted drop bars to a flat bar frame necessitating a very short stem, the handling absolutely fine, in fact really good at speed, so ignore those who think they know more than they do