The hammer is the way to go. If it doesn't pop on the first or second tap, a little penetrating oil should help. Heat is sometimes necessary, but nothing hotter than a propane torch. Pickle fork is only useful if you plan to replace the tie rod end. It's not indicated for simple disassembly. The puller you are looking for can be found in a number of different places. It's a fairly standard tool, as most all of the tie rod ends on the planet are the same. Snap-On, S-K tools, and a number of others make them. Bavarian auto sport and Performance products also sell them. Good Luck...

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Jeff L
1987 300e
1989 300e
1987 BMW 325