nothing radical to suggest, just...
starcharts
possibly a night light (dd got scared of dark at 2 but couldn't quite vocalise it)
talking up how big children sleep in bed all night without getting up
when we transferred dd just short of 3rd bday we kept her in her grobag for a week or so for security. then we used a duvet, tucked in sideways, so she still feels 'bound in'. she has never got up/out (even though we'd quite like her to start thinking about getting her to use the potty at night)
ok, this is just my POV, but don't fetishise the restlessness at bedtime. IMHO, if you do that, you give it licence. i wouldn't start getting into the 'staying in the room to settle him' malarky, as there will be no end to it. just settle him with minimum fuss and get out of there. repeat as necessary. if he doesn't get a rise out of you, or a nice burst of attention, he will get bored of it pretty quick.
dd is on the storey below us, so we still use a monitor/keep her door open. it has never bothered her.
the key with all of this (as with so much) is i think not to betray a flicker of anxiety. don't let him sense you're apprehensive about the new room, the bed, the fact he may try to get up. if you do, he'll be onto you like a terrier -- and the battle is lost.