Nice to see someone from the EU on the forum. Im in the netherlands thus verry close to you.
If you don’t mind. It is helpful to fill out your climate zone/location on the profile part of the forum
That way people can give you better advise.
If you read the manual, you’r supposed to active a bud to grow an upright every 20 cm (8inch). You can do this by notching or rubbing off other buds.
You could leave both buds. You could leave 1, or you could remove both (in the picture it seems like the 2 horizontal facing buds are close to the left and right buds. Thos left and right i estimate are about 20cm apart?
It might not give you a clear picture of what to do. The thing is. as long as you end up with 1 upward growing shoot around every 20 cm in the coming years. Your fine. There are multiple ways to get there.
I would just leave both buds. And prune the shoots where you don’t want them early. Or i would rubb off all buds except 1 every 20cm.
I have no experiance with keiki paste. Seems like an intresting thing. Basicaly cytokines in paste form. To promote shoot formation. You can however get the same effect by notiching. (decreases auxines coming from shoot growth, increases cytokine buildup coming from root tip growth)
I would recomend experimenting with it. But not now. There are many proven ways to get what you want with the UFO training. Better to go for those. And run a seperate experiment with keiki paste.
Also it will be quite normal to not have all the uprights grow in the 1 year. That is why the guide recomends pruning away the overly vigourus uprights, and shortening the others a bit. To get more uprights the 2e year.