Yes, pickerel and LMB can live together... However, in most cases LMB tend to out compete pickerel.

Where do you plan to source your pickerel? As far as I know, there are no commercial sources for them?

A pond your size is generally not a suitable to size to produce a quality LMB fishery... What would you like to see out of your pond? we may be able to recommend a species combination that is suitable for your goals and the size pond you have.