It is very much technique and less strength. I too (as someone else mentioned) have an FJR1300. Actually not much heavier than a stock CB750K as materials and engineering are far better than back when.
But in both cases, the push down with foot is key. I like to tear these things apart. How can one push down with foot against an immovable object? True there is a rocking motion built into the centerstand. But still....
In order to push down, one must anchor oneself otherwise you would simply go up. So the anchor point is the right hand on the handle. Now, with your weight on your left foot, direct the mind to your right leg, not your back. Push down, shift your weight from left to right (pushing back) and the anchor goes up. Your leg is likely stronger than your back and your arm. The up part is the reaction to the down part.
Of course all the basics must be there, both centerstand feet on the ground, the handhold must be intact, etc. But not much emphasis on the handlebar. Good grip on the left grip. Some like to turn the bars to the left. But if leg technique is correct, the left hand does no work.
One mentioned the trick of a small momentum backwards, only a few feet will do it, then a quick step on the footpad and the bike will leap up onto its stand. Must be careful that the pavement is not slick however, or you might end up on the ground.
All in all though it should not be a struggle. Good luck.
