Had my day out.
Had the kit on me for 5 hours of a 5 1/2 hour day.
Must say it wasn't as bad as I thought
In the end I put the lens barrel over my left shoulder and right arm on monopod
I had my padded strap under it most of the time. I did swap shoulders often
Also the manfrotto neo tec monopod is amazing. The way it just pulls out and locks without having to fiddle with several locking mechanisms. Definitely a good buy.
The half gimbal head was useful too. Especially for the bird display
It was heavy, probably about 4kg on one shoulder but far from unbearable