Question Newer engine to older frame


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Maybe someone has more experience to comment, what are the options to get the gear indicator/neutral to work for the 2019 engine at the 2015 frame, dash and ECU?

To a bit of surprise were to me the gear pickup mechanism from the shift drum has been redesigned physically and logically for the newer engine model so there is no way how to obtain either neutral or gear position info through the same wiring.

Anyone who has encountered the same challenge? Is there a way how to integrate a new 2019 engine without the change of the whole electronics of the bike together with the wiring harness and ECU?
Maybe for the most straightforward mechanical change, is the old 2015 shift drum possible to be fitted to the new 2019 engine which would, in turn, bring possible to use the old model gear sensor and connector?