I will try my best to answer your questions do let me know if anything left out or misunderstood.
For question one, you could do a polling to multiple repositories using Triggers in Bamboo. If you have specified a multiple directories in one plan or maybe shared repositories, you could see them in the trigger configuration, you could just check the one that you would like to have the polling trigger from.
Yes, it is possible, you need to choose Repository triggers the build when changes are committed option. However you need to configure webhook from SVN side.
For more information please refer to the following documentation.
Hope it helps.
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