Do you have any soffit vents at all? I had some and then added probably 50% more but our roof construction was a bit more typical. Adding the air channels was the hardest part. I used a sawzall to remove the existing boards and then added vents. I made the channels out of radiant barrior OSB cut to fit. They do make foam channels that you may be able to use. You then might be able to fill underneath with spray foam. You may also be able to build your own channels using 1 or 2 inch rigid foam. Are your rafters 2x4 or 2x6 construction?
As far as covering the insulation in the attic, you may not want an impermeable surface since you want moisture to be able to escape. At least that is how insulation is set up here. If that is true for you, you could probably try window screen. It comes in rolls and would be pretty easy to install.
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