Its a small world, I lived in Cardyke Farm, now a cat home, which is just outside Auchinloch, indeed I attended Auchinloch primary School followed by Lenzie Academy.Cycled all over Springburn, Balornock, Auchinairn and out to Lenzie, Kirkintilloch, Auchinloch and such parts many years ago, probably before you were born, on my first two-wheeled bike Andy. It's a lovely part of the country and I have fond memories.
Your suggestion that the Kalkhoff XXL may be the best option sounds as if you have done a little research and I think you would find that perfectly adequate for your needs, even at 25 stone. The Agattu range has become a byword for quality and reliability, offering decent performance within legal parameters.
Yes, you can go faster on an ebike but you will probably need to buy something illegal and accept the risks inherent in that strategy. Many perfectly legal ebikes will assist you more than adequately both on the flat and over the hills but the choice is yours.
A combination of regular walking and as much cycling as you can manage will very soon pay dividends on the weight front, provided you take it easy on the grub intake. As for which bike, do get at least two or three test rides under your belt before buying something. You may have to travel some to get a bit of choice.
Slange!
Indalo
At some point we have no doubt been in very close proximity to each other.
Andy