Light deprivation is the only solution to getting your harvest before the harvest as your seeking or asking to do, figure your optimum spot for sun exposure, figure hours of sun exposure,get supplemental lighting for the weaker hours of natural light(you need 12 hours light just like 12 of dark, and not 8 or less of good natural light they'll get), get a heater in case, and prepare to pull a tarp or whatever will be used to completely black out the plants, and it must be blacked out,pinholes will cause you nightmares.
I have partner who may do this on my farm using chicken wire laid down 1st ,then pallets put down next so plants can breathe, bales of straw or rice, stacked 4 or so high with a pattern to allow air movement in and around plants , we will use 10 or 15 gal smart pots , and a blackout tarp will be pulled religiously everyday for the duration of flower, incorporating small old woodstoves stoked properly to heat if needed , simple and hopefully productive, well for me at least, my partner has already run several like that and done just fine with 10g smartpots , 1 month veg and pulled 1/2 pounders!!!
I cant wait till I get my greenhouse put up this coming fall, it will make winter just that much more fun!!!