I think I might just be going a little paranoid on you, because we talked extensively about the pump inlet, a couple of months back.
If your description is accurate, I think you'll be OK.
As for the pump heat (the heat from the coils, not the heat from the pumping action), yes, venting it would help, but it won't affect the water temp in a measurable way. If I could do that mod, I'd probably jump at the chance to do it, but just make sure that you're not going to accidentally cut a coil wounding, otherwise the pump is toast. I would expect the winding to be pressed against the inside of the pump casing, so using a Dremel is definitely out. I'd highly recomend taking it apart first.
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