There's no reason for refusing to use a microSD for maps which i can think of. In fact there are valid reasons to do exactly the opposite of that and use a card for any detail map but in particular 'unofficial' unlocked maps. Not the least of those reasons is that should a map be corrupt and 'brick' the unit, simply removing the card will restore it to normal operation. Using a 4GB card costing a few bucks could save a world of grief.
Unfortunately there is no way to extract POIs from the detail map as you've asked.
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