Okay, after a few more hours (oof) I have what I think is a complete grid (bar one cell) plus the amended title.
The last cell is in 9d ("Sure to be scuttled on sea, began again (4)"), which I presume is defined by a word from elsewhere. I still have at least two excess words I've not yet accounted for, in 2d and 32a. The extra word in 32d seems like a potentially good definitional match, but the extra word in 2d maps to 32d's wordplay much more tightly. Either way, though, I suspect there's some thematic material going on with 9d that I've not identified.
Any hints about any of this? Thanks as always!
(First part of 4d's wordplay is also eluding me despite the definition being very clear and a word removed.)