You can’t reverse swap the platforms.
The series 2 met different emissions targets and you can’t replicate them with a series 1 drive train.
Also the wiring is different. To make them compatible will be as complex as swapping a whole different engine in (as a 2JZ or an old 5ltr V8, not that it would be possible to register it after that).
While the outside and model are still VE, they are too different.
Also the series 2 uses different engine management with high pressure and low pressure pumps and associated sensors. The variable flow intake is gone on series 2 engines and so that harness will need modification.
It’s going to be a shitshow.
What is better is to find an engine and gearbox from a series 2 and use your spare chassis. Or easier still will be to find another series 2 and buy it.