Well, the only approach I think that could work barely well for end-users trying to emulate Motion Plus games in conventional controllers (e.g. keyboard/mouse, Xbox 360 Controller, etc) would be "recording" the movements from a real Wiimote with Motion Plus to a file/macro/whatever then allowing the user assign that recorded movement to a key or button. But all of that is just in theory, actually implementing that would have it's own challenges since every Motion Plus game uses the sensors in different ways, there would be also the challenge of recording complex movements and the likes...
Avell A70 MOB: Core i7-11800H, GeForce RTX 3060, 32 GB DDR4-3200, Windows 11 (Insider Preview)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)