Has anybody ever managed to replace all the glow plugs without taking off the intake manifold

I think I could get to most of them by removing all the injector lines but the rear one might be tricky.

I ask because I really don't want to mess with the IM, gasket and all the crap attached to it.

I'll do it if there's no alternative.

I also insist on replacing them ALL.

If I can't replace them all then I'll go ahead and take off the IM, begrudgingly....

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1993 W124 300D
-297K on the clock as I type this.