Yeah, it sounds like Starline isn't going to say that .32 Mag brass can handle 45K PSI, but they're probably confident it can hold up at pressures over 21K.
I would try everything in a .327 at first just to check for pressure signs, then move over to .32 Mag. It seems OP is looking at getting .327 revolvers anyway in which case I'd have no concerns about loading .32 Mag into +P territory.
@jski if you load any hollow points for the LCR stick with the 85gr XTP's and get them moving at least 1000 fps, that seems to be how fast the .32 XTP's need to go to expand. All the velocities I see listed in books and guides use a 5 or 6.5" barrel, so going to a 2 inch barrel means you're likely losing 150 to 200 fps and that puts you in the danger zone of not driving the bullet fast enough and .32's that don't expand aren't great.