AT, I just looked at a Dart cutaway. Yep, it looks pretty challenging to remove the housings from the centrifugal stages -- and likely even more fun to get them back on right
But all those bolts would keep the volunteers busy
My initial take is that the early centrifugal compressor engines had admirable reliability and were less fussy than the early axial jobs. The T-33s and Vampires were flying long after they went out of active service.