yeah, don't. Leftys are great, the pre 2012 are even greater, but that's another debate.
what I would suggest is get an ebike that has a similar geo and travel, then contact Project321 and get an adapter to fit your new ebike with your old lefty.
Then, get a DVO JadeX coil for that plushness. Double check your new frame has progressive backend linkage. If it is more linear, get the DVO Topaz3.
At this point, you will have a good ebike with that great Lefty plush feeling.