You'll be pressing alot of contaminants into the oil that way imo, reason people don't do that. Turning it into kief first eliminates that and you are pressing product only no contaminants....Im sure
@doublejj will chime in but thats why I suspect its not done that way....
I dont know about the contaminant part, if you have it into a puck and then into a filter, give it a min for the heat to do it's thing and the oil coming out is still very very clean, I am not sure about the OP scenario but I get way higher grade pressing my flowers than pressing my dirty drysift. I think low temp is key..
I am gonna share how I do it with the low temp heat plates. I only have had them for about a week so take this with a grain of salt.
Here is the best way to get the best cheap rosin without having to buy expensive screens. First, press you lower buds or buds in the parchment either as a pre pressed puck or simply as single buds, spread em out ( I have the 4 x 7 plates) press the shit out of them, no screens( I only have a 10 ton press that I take up to 5 tons at most because anymore and I find the parchment paper tears anyway) Quickly collect all that rosin ( there is a LOT of absolutely perfectly clean rosin here but I just quickly harvest everything, contaminants and all, repress the puck 1-2 times depending but I am not that greedy.
Once I have the dirty rosin, that's where the magic happens, I simply use the melitta coffee filters, brown, unbleached, no 4 or 6. I carefully wrap 2 layers over the whole puck of dirty rosin, press it SLOWLY at 182 settings. If it blows out I start over. Just getting the hang of it right now... After that you are left with some FIRE rosin, flower rosin is the best, I have yet to get that same quality with my dry sift probably because I am rough with the drysift where as the flowers I have pressed so far were well cured, super resiny, at around 55-60% RH.
With my little 10 ton press from canadian tire, pushed to 5 tons on my average final squeeze, I get 12-16% return of absolutely fire low temps rosin depending on strains. Actually that doesnt include what I dab while I make it. I am really stoked with the plates I got from low temp plates, and since I only use them on low temps (87 for flowers so far and 82 to clean the rosin or press drysift) I get the best quality rosin.
Good luck everyone.