You've already spent near $40 on parts and tools and the hose modification looks like another $30-40!

Too bad your this far down that road already! You could have contacted Roy here at Fastlane and see if he has a line on an oil cooler as a used part which they sometimes can and if not contact Potomac German Auto, they sell a good used oil cooler for about $100 usually, they are both great to work with by the way!