Written with DCist contributor Amy Maxmen As we’ve mentioned before, big changes are underway at the Velvet Lounge, the hole-in-the-wall music venue near the corner of 9th and U Streets NW. Soon change will also spread next door, to the burnt-out remains of the after-hours bar formerly known as Kingpin (not as an extension of the Velvet Lounge as was originally rumored, but as a separate, new bar). But rather than profiting off the wave…