Gee this is a hard one!
Would he fall asleep if you started with 'quiet time' ie reading or just laying down together?
How about block out blinds, so his room is dark?

Will he sleep in the pusher? maybe take a walk every arvo?

Otherwise, Id personally jump in the car every arvo and Find a nice quiet place to park, then have a coffee (travel mug( and read a book for and hour, then drive home