Thread: Waldorf KB37
Apparently it can house up to 107HP
https://waldorfmusic.com/en/kb37
To get this width you would need to buy 1m rails and cut them to measure. Otherwise, you can get a Make Noise powered skiff and fit a spacers on the sides and have a bit more than the nominal 104HP.
Otherwise, if the keyboard is a must for your requirements, look at the WMD Monolith.