Some will, in any case my local shop in Sydney does (someone traded in their Trek hybrid, which was sold onwards to me).
You will need to ask around at all your local shops to see if they any accept trade-ins.
Nothing of course, bike shorts are so much more comfortable that way.
The benefits of wearing padded bike shorts (with no underwear), include having some padding to your sensitive areas, with no uncomfy seams (which can cause unpleasant chaffing).
EDIT
If you are worried about personal...
Why? - Because most bicycle companies like some variety & often change the frame colour of their bikes.
The "Rosie" might be a cute bike, but if you look thru the electra cruiser catalogue & visit some bike shops to see what the newer bike designs look like, I'm sure you'll find another bike...