VEVOR Button Maker Machine, 2.28 inch/58mm Pin Maker, Installation-Free Badge Punch Press Kit, Children DIY Gifts Button Making Supplies with 500pcs Button Parts, Circle Cutter, Magic Book

I have seen other sizes for sale, yes. Honestly, i just bought another machine, because the amount of items you get with the kit is far more cost effective than buying everything separate, unless its a great deal.

I don’t think so. Fabric would be too thick. If you do a search, there is a different machine that does that.

No the backs of the pins are plastic so no issues with the magnet.

Yes, you can buy the supplies to make more buttons. They can be purchased separately through Amazon. I have not looked into buying parts to make keychains. Good luck!

Yes, you can purchase additional die sets that will fit the press. The ones I've seen are in the $78 neighborhood, so they are not cheap. When you take into consideration that the press comes with 1000 or 500 button blanks, it almost makes sense just to purchase an additional press. Just my opinion.