The trichs wouldn't all be gone, many people do 2 or 3 runs of trim through the bags. If you are going to use the trim after a run through the bags are you going to have to dry before making oil? If you are then it seems like a huge pain. Why not do both by splitting up the plants for each process, or you could dry sieve the trim and then make oil.
Don't know what kind of oil you're making, I make Canna-oil. I dry sieve all my trim first and then make my oil. I use all the trim from 6-8 plants in 60 ounces of canola oil on low heat (200 degree) for 3-4 hours, then strain, use sparingly. I make brownies that call for 1/2 cup of oil and makes 12 brownies.well the reason i was not considering half the plants for oil and half for hash was because i was figuring that if i did hash first then oil after i would be able to get all the left over and not wast any thc that was not extracted from the hash making.
now after making hash with my trim how much trim shoudl i use to oil? i would assume i would need to use alot more trim to make anything decent oil wise