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The reason it is not considered a good idea is because normally a tree dies from a disease and the next tree can be killed by the same disease. Plus, the weakened root system, which tends to live beyond the top of the tree, can attract disease.

If you feel the tree that was there before was disease free and died of other causes, you should be ok planting a new tree there.

Just get the soil tested, as decomposing wood can cause acidic soil occasionally. Other than that, it should not be an issue.

It really depends on the type of spray used. Some you can go out immediately, and others you should wait a few hours.

When you remove them from the mother tree, make sure that they have some roots on them. I would actually pot them up and keep them in a somewhat shady location and keep them well watered until you see them producing new growth. Then you can transplant to a new location and treat as you would any other newly planted tree.

As long as they are smaller trees, yes, you can do this. The larger the tree, the more likely it is to go into shock and die when move, especially when moved into a pot.

If you plan on doing this, I would do so now and keep them well watered. This will allow them to acclimate to the pots and they will be healthy looking by the wedding. If you do it close to the wedding, the trees may go into shock and not have time to recover from teh shock before the wedding.

This article may be helpful:
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

Wet weather has resulted in molds growing where we don't normally see them. Use a broad spectrum fungicide on your trees. As for the suckers, think of them as branches. There are no roots to transplant. Cut them off at the ground.