I may have come up with an easy solution.
With only 1% of the suns UV getting through, it's a miracle anything grows at all. Since I need to start seeds in the house and want to do it without using electricity, I am relying on the reflector to enhance the small UV exposure we do receive. I'll also be using a mini greenhouse outside and winter sowing a few plants, so between all 3 options, I am hoping we can effectively grow plants.
If you have non-argon windows, then the reflector should help by leaps and bounds and allow you to effectively window garden. Let me know how it works.