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I think you could keep a wide address space, but still use narrower types than absolute pointers for most of your references
Wouldn't this require things that the allocator can't guarantee? (Like pages being relatively <32 bits apart in address space)
A general allocator, yeah, but you could conceivably organize your objects in a way that you can use alternative indexes
It would be fun to try to make a pseudo-x32 environment that can run within an LP64 environment. Have the binary reserve 4GB of BSS, use a custom allocator that grabs memory out of that space, and thunk the host OS interface to transition to big pointers when needed
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