There is a decent primer on sunflower oil available on the Journey to Forever website, originally from Organic
Gardening magazine http://journeytoforever.org/biofuel_library/oilpress.html I recently learned of a hand cranked oil press being made in the Netherlands, while I don't
think oil production levels with it would be considered all that "
profitable" in the western 1st world countries but it might be a stepping stone for you.
http://www.piteba.com/eng/index_eng.htm Please note that this is not yet a personal recommendation of this company or product, but I am scheming to get myself one.
edited to add
HA! Both of the links I provided were already provided elsewhere on the forum
https://permies.com/permaculture-forums/310_0/homestead/harvesting-sunflower-oil-yourself There is also this farmer pressing his own to fuel his farm engines and sells presses
http://www.oilcrusher.5u.com/index.html