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Cold-temperate Pinguicula seed stratification - freezer ?

I have some P. alpina, P. longifolia, and some P. vulgaris seed to sow.
I've read they require temperatures in the -10C to -0C range when stratifiying.

Could this be done in a freezer for part of or for the full duration?
I realise that the standard freezer is set at -18C, but was curious to know.
They don't need freezing conditions (at least vulgaris doesn't, but with it being one of the most cold-tolerant I'd assume the rest wouldn't either), but the seeds do need to be relatively fresh in most cases.