Definitely back up a visual approach with the ILS. This allows you to remain at or above the glideslope as required by FAR's. Class B airspace shelves are designed to contain the glideslopes, so remaining at or above it will keep you from descending outside the bravo airspace.
There is no published missed approach procedure for visual approaches. If you go around you need a heading and altitude assignment from ATC. In the event of lost comm, comply with the FAR's. Remain in VMC and land. If a published traffic pattern exists, comply. Do not forget to squawk 7600.