Omega Seamaster Planet Ocean broken clasp

Yesterday I caught my planet ocean on the handle on our fridge just the right angle and unfortunately it has pulled out the riveted pin that the clasp locks onto. This is a watch ive built up from omega parts so I don't have a warranty. I was wondering if anyone knew if you could get a new pin (or just the bit that the pin attaches to? Its a micro adjustment clasp and I'd like to avoid paying 400 nzd for a new clasp if I can help it! Here are some photos. Any suggestions much appreciated.