Just for shits & giggles (and picturing Trump in an orange jumpsuit) I was trying to figure just what would be involved. This is pure speculation on my part:
Enhanced screening/background checks for all Corrections Officers who would or could have access to Trump's cell (ooooh, 'Trump's cell', puts a smile on your face, doesn't it?)
Probably 'dedicated' CO staff for round the clock monitoring & for dedicated 'escorts' within the jail.
Secret Service Agents would need to be there 24 hrs and would probably get some kind of special pay rate for it since it would probably include being 'accommodated' in nearby cells. This would probably include Agent(s) right by Trump's cell + Agents at various 'points of access'. Probably more than he normally has 'tailing' him.
'Secure' cell, which would probably entail other prisoners being moved and rehoused away from the area around Trump's cell, past whatever points of security (doors, hallways) they could create.
'Secure' toilet & shower area as above
I mean, they'd probably have to lock down a wing or corridor of the jail and 'lose' a good number of staff to keep Trump 'safe'. I can see Judge M wanting to avoid all that hassle & expense. But you know, there are some jurisdictions that make the offender pay a daily rate for being in jail as part of the 'punishment'. That would really grind Trump's gears. Not only being in jail, but having to pay for it himself!
Better yet, how about Judge M just 'incarcerates' him in a Motel 6 off the Jersey Turnpike.