Okay. Screwy idea #2.
Get some day laborers from your local Home Depot parking lot to dig up the existing line. Lay a new line.
My son did that (sort of). His next-door neighbor (from Guatemala) dug up about 60' of sewer line and replaced it with some sort of heavy-duty PVC-looking stuff. Total charge was $500.
Screwy idea #3
My city replaced the sanitary sewer main serving my home not long ago. The original line was 8" concrete pipe. They replaced it with 10" PVC-looking plastic. What was novel, was they did it without digging up the original! Here's how they did it.
They started at one end of the block and PUSHED (more like hammered) to new pipe in place. As it moved along, it fractured and split the old concrete pipe. Then the contractor came along with an itty-bitty Bobcat, dug down 8' to the new line and attached each individual home to the new pipe. After that, another crew followed, repairing fences and re-sodding the yards where they dug access pits.
Point is, there may be a similar service available to you.
Screwy idea #4
Sell the house and move on.