I fly a "Z" B-25......haven't had that one happen .........but does present an interesting scenario......definitely fly for awhile and think about what options there would be.........landing on mains and holding off nose would be an option if on pavement......but grass probably would shear out nose gear...............I have engine kill switches that I can operate inflight......so the more safe bet for me would use use enough flaps thats possible without damaging them on a belly landing......set-up a routine landing approach......when the plane gets into ground effect .....hit engine kill switches and float it in with gear still retracted.........and hopefully go out....pick the plane up extend the gear and reinstalln the departed nose gear tire ......put some fuel in.....air up retracts.....and go fly again..............sounds easy......but can be done......Bill........