Crimping the line shut with a standard injection pump would be a bad idea since the fuel has no where to go.

A common rail system where the injector is operated by the camshaft would be a different story.

The compression fitting fix is only a short term repair, at some point it is likely to come apart but it did get you home.

Plumbing the failed line back into the return system would be just fine because free flow pressure will be just a few PSI. The line in a bottle trick takes even less parts.

Had a similar situation occur in the 220D while driving in the boonies of northern Wyoming. Called ahead to Billings MT dealership, to see if they had lines for sale. They did, but would not be open long enough for me to get there. Suggested that I head back south to a small town with a reputable mechanic. That was good advice, as he took off the line after confirming that I could get the engine primed back up after the job, and proceeded to braze the leak. Worked great and that line was still on the car when I quit driving the car several years later.

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1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150