[hannah]

I don't have solid answers, only suggestions. 
Why not use the ground seeds or powder in the oil, leave it to soak and absorb what we want, and then decant the oil, leaving most of the powder or seed fragments as residue in the original container. 
It could be filtered well with fine mesh, I think.

-Dianna

Thank you Dianna, I'll consider this one. Especially for mentioning ground seeds, that might tackle the problem of seeds not/or do absorb into the oil.