Well for those of you who care (or may in the future), I was able to remove my broken spokes(and nipples) without much trouble just by using a couple of tire irons to move the tire over and then grabbed the nipples with a pair of needle nose pliers. It took about 10 minutes of fiddling, but I got all 4 broken spokes without dismounting the tire or removing the wheel from the bike.
I broke all 4 spokes when trying to tighen them, it looks like the combination of packed silt and rust(?) seized the spokes and nipples together over the years. I sprayed some penetrant into the nipple before trying to tighten them, but I think it was too little too late.
I am not sure what the lesson is here, probably keep the spokes tight and the nipples lubed on a regular basis to avoid this. I supposed I could have never bothered to tighen the spokes and it would have been fine for 5 more year till the rim taco'd, oh well.
Time to order a few spokes and see if I can get it back together I guess!