to remove the nose gear if the bolts won't come out and you are planning on replacing the gear anyway, just cut the heads off the mounting bolts with a Dremmel cut off wheel.

then to extract the bolts and bad blind nuts tap the bolts with a hammer to pop them off the backside of the firewall, they will slip through the holes and replace them with new ones.

you can get new ones from the local ACE hardware store for a few cents a piece.

what I do with blind nuts is get them in position, thread a longer bolt in them, and pull on the bolt firmly to set the points into the firewall, then carefully unscrew the bolt and dip the regular mounting bolts in Vasaline,screw them back in, and fully set the blind nut by tightening the bolt with a washer, so it doesn't dig into the firewall,then a little 5 min. epoxy on the nut tops, and the nuts will be set.

the Vasaline will prevent the epoxy from sticking to the bolts.