You can use a track cog on the original wheel. I call it a suicide hub. If you do it make sure you use lock-tite on the threads and if you can fit a bottom bracket lock ring on there put one on. Don't skid on it though It will loosen up and very bad things can happen. You can also use the cottered cranks they are heavy and you won't get a good chain line but it should be close. I have never needed a special tool to remove cottered cranks I just bash out the cotter pins with a hammer and the arms come right off.