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Wouldn't necessarily 'help' but I'd say would improve the photos. No, they wouldn't end up being underexposed. I don't want to be writing loads so here's a couple of links for you to check out.
Here's a bit of information about the type of film you're shooting: http://www.guidetofilmphotography.com/pushing-pulling-film.html
Some people's experiences:
https://www.l-camera-forum.com/topic/174764-ilford-delta-3200/
Yeah will do something like this. May try some golden hour portraits, but also have some porta 800 colour that would be better for that