Well, if you buy seed and plant it now, then in a couple of years you will have lots of healthy variation in your regales to choose from.
If you wait till autumn to harvest your own seed, then you won't be planting till next spring, so it will take a year longer to see flowers.
I'd do both!
(But wouldn't bother scaling anything till I had seen if the plant was what I really wanted to multiply, or was worried about losing the adult bulb.)
That's just one opinion - what do
you want to achieve?