For breaking seed dormancy the peroxide would probably need to be stronger than that, something like 1:10 to water. One of the experiments I did with plain water soaking showed worse germination in 4 weeks than the same batch of seeds planted in medium. While 16% of the seeds had germinated in the water after four weeks, 28% of those planted in medium had germinated in the same timeframe. That leads me to think that soaking in water is a disadvantage for daylily seeds. This was with non-stratified daylily seeds that typically have roughly 25% germinate right away and 75% delayed by seed dormancy if not stratified. It's possible that people whose seeds don't have seed dormancy may have higher germination in water.
Having said that, there's no need to soak daylily seeds in water, they don't have a hard seed coat, nor is the seed coat impervious to water. They'll germinate just as well or better if just planted normally. The dormant seeds will germinate more quickly and evenly if stratified, though, so certainly planting them and then putting the pots in the garage fridge for a few weeks should work. They should germinate more or less together and within a week or two after you remove them from the fridge. I might separate out the ones that have already germinated though, they don't need to chill.
I'd be kind of surprised, given where you are, that the seedlings would flower their first year to any extent but if you push them one or two might. Others can answer that question better than I can, I mostly just experiment with seed germination and don't usually grow them on.
