Andy - Personally, rather than wire brush to get rid of the rust and debrie on the valve train I would wipe with a damp micro towel using mineral spirits and a vacuum close to the work as Mark suggests. Don’t risk any large particles clogging oil passages. Then coat the valve train with a liberal amount of engine oil. As you will store the car in a heated garage and be using the car more than it has been used in the past it should not have as much condensation as before. To burn off any condensation in the engine and exhaust system I would run the engine 20 to 30 minutes at least every other week. As far as removing the oil pan unfortunately you may have to raise the engine. Your service manual should describe how to do it. Since you are going to have the engine raised it may be a good time to install new rubber motor mounts. A new pan gasket set can be had at NAPA. The valve covers just need to be cleaned out real good and coated with oil. Make sure you use rubber valve cover gaskets and not cork. I would suggest adding a pint of Marvel Mystery Oil with next couple of oil changes.
Good luck,
Dick.