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That's such a tough call.
I love to give my trees and plants every chance to live, but serious tree issues that could spread to other trees is concerning.
Here are links to the treatment course for the above mentioned issues just incase you would like to continue treatment.
I wish you luck.

https://www.gardeningknowhow.com/plant-problems/disease/shot-hole-disease-fungus.htm

https://www.gardeningknowhow.com/plant-problems/disease/weeping-amber-in-trees.htm

Simply cutting the sucker off at the ground and painting the fresh cut with undiluted Glyphosphate (Round-up) will cause the roots to suck the herbicide into its local root system and kills the local roots, no need to dig them up. If by chance it does try to regrow, just repeat the process as the sucker roots will have been weakened.

Trees tend to put up more suckers when they are more stressed. The less stressed the tree feels, the less suckers you will have.

I personally like neem oil for pest control. It is organic and safe for people, pets and beneficial bugs. This article has more information:
https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm

I do not believe that this variety would work for a container potted specimen.
Perhaps it would be available in Bonsai form. The container size you mention would be for a Bonsai tree.

Here are a couple of links to articles with more information:

https://www.gardeningknowhow.com/special/containers/how-to-grow-container-trees.htm
https://www.gardeningknowhow.com/houseplants/bonsai/bonsai-basics-starting-your-own-bonsai.htm

This could be an number of things. Have you checked the trees or signs of insect pests? This could be one reason for the decline of your trees. A fungus of some type could be another. Neem oil, often sold as fruit tree spray, can help with either of these issues. The heat could be another factor, causing stress on the trees. Up your watering regimine and see if this helps.

There are different cultivators of Cherry Trees, Sweet or Tart.
If your not sure of the type of tree you have planted and they are tart, you likely will need to make pies or jams and jellies with the cherries.

Here is a link with more information.

https://www.gardeningknowhow.com/edible/fruits/cherry/cherry-tree-care.htm