Well, tomorrow is exactly one month in to the accident, so I thought I'd update this thread to offer some insight and encouragement to anyone else who might encounter this in the future.
My fracture wasn't too complex. I have a small non-displaced fracture of the radial head, but luckily it's not inside the joint. My ROM has improved significantly over the last month. Rotating the palm up is back at 99% (although not without pain), rotating the palm down is at 100% and without pain. I can't fully stretch my arm yet, and the although the progress was quick at first it seems to have come to a complete standstill over the last week. I'm at about 85% though, so I guess I should be happy with that. Also there's no pain involved in stretching it out. Bending the arm is unfortunately more difficult. I'm back at 90% there too, but bending it involves a lot more pain. There's also still some positions when for instance keeping my arms up at shoulder height in which I can't bend it much.
I've been doing quite intensive PT for the first month and have really benefited from this. Last week due to schedule issues I didn't visit the PT and I must say that it has made a big difference in stifness and pain, so I'm definitely going back in the next couple of weeks.
I've lost quite a lot of muscle in the left arm and weight lifting or any kind of strength training is definitely still out of the question. I fear this might take quite a while to heal.
Not happy to hear about your accident, but glad to hear things are on the mend !
2.5 years later I still do ROM exercises a few days a week. Rotating the joint makes crunching noises (which I am told is common), but the range is pretty much back. Have not had any issues cycling or climbing.