Maybe. That'd still put the distribution in the strange position of shipping old 32-bit versions of libraries alongside newer 64-bit ones. I'd be concerned that using two different versions "side by side" could cause problems.
I don't understand, why ship different library versions for 32-bit and 64-bit? I'm proposing they reduce their maintenance burden by dropping 32-bit completely on non-LTS releases and keep supporting it properly on LTS releases for the use-cases that require it
It seems impractical to drop support then re-add it. Probably less work to keep building and testing it all along then to have to fix 2 years of 32 bit specific bugs all at once.
How much of the maintenance burden consists of 32-bit specific bugs? I would guess almost nothing, but I have no idea really.