It’s an option, yes. I do the same as I have multiple rooms and a perpetual grow so I move plants from the veg room to the bloom room and put frames right at the canopy.
If it’s a very stretchy strain, I may still have to tie some branches up after a month or 6 weeks but the average “medium-stretch” strains with decent branch strength will almost perfectly stretch into the trellis, then around day 16-20 into 12-12, I’ll trim up the lowest nodes that wouldn’t produce anything worthwhile and let them go.
I will say that any very short and/or low stretch strains do NOT benefit from adding a trellis after switching to 12-12; atleast in my experience. Always seems to be worth finding alternate ways to support heavy branches if they simply don’t stretch enough to put some height above the trellis.