Pepper isolation needs depend on how much pollinator activity you have. I do isolate branches or entire plants when it's something I'm trying to increase seed for, but I also have low pollinator activity here so even non bagged seeds have only ocassionaly thrown a cross for me. All depends on your area.
If you use organza bags you will have some fruit set problems due to heat buildup, but I usually get at least one or two per bag to set.
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