Not as head coach, maybe assistant.
There must be a reason why Roberto Martinez didn't take him.
What Lawrence doing now?
He is not luggage, Martinez can not take him everywhere.
The make up of a club is vastly different than a National Team, the structure and demands likely did not have room for him since Belgium was not changing U15, U16, U17, U18, U19, nor U21 coaches as they have confidence in their development plan.
I am not sure where Dennis is, note that Martinez did take three persons with him but those guys were with him at Swansea, Wigan and Everton. Dennis was an a valuable assistant to Martinez but not a the level of Graeme Jones.