CW: Spoilers for Murder on the Orient Express (probably unnecessary by now!)
This sounds pretty awful. Poirot may be comical, but he's not meant to be a comic character. The book is actually meant to be read as a straight drama.
Also, eight suspects? That entirely removes the symbolism of the twelve killers being equivalent to a jury.
'The production cuts down the original suspect pool from 12 to eight and, as in the book, the bulk of the action takes place on the train. “They’re best if they’re in that one pressure cooker of a place that is closed in – that’s when great laughs happen and also great tensions.”'
https://www.theage.com.au/culture/theatre/murder-on-the-orient-express-play-20261021-p616rw.html