Can outdoor plants be forced to start flowering early?

Can outdoor plants be forced to begin flowering 2 weeks to a month early
using liquid flowering neuts?
Is there any type of method to start and finish flowering early outdoors?

The Nutes won't make a difference. Light hours do. It can be done but is a lot of work moving or covering and uncovering them everyday.

changing to bloom nutes 2 weeks to a month before flower will only cause nitrogen deficiency

Pretty much only way is to make them get less light. So you either need to move them into a dark place to increase the night or cover them. Either way its a decent amount of work to accomplis.