What can I do with a long horizontal run and no pitch?

[a;lkjgf]

Everything is trenched for the new bathroom, but when they took the original toilet off they discovered the drain was only 3 inches under the surface, leaving us little to no room for correct pitch. We are trying to carry the line 20 feet, but will end up with the 4 inch pipe 2 inches above ground if we go with 1/8 pitch. We do not want to raise the floor or have a step up into the toilet. Would an ejector pump work for something like this? Any ideas or tricks?

 

[hj]

Where would you put it?

 

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[Reach4]

OP made 3 nearly identical posts. There are also replies on https://terrylove.com/forums/index.php?threads/long-horizontal-run-with-no-pitch.61486/#post-455513 of the collection.