Not a big deal to cut the old adapters off and weld new ones on. The adapters are only about $10 to $12 and the teeth about the same price. A good welder could fix that in a couple hours. Probably less than $300 for everything and you're good to go. That bucket is in good shape. It takes thousands of hours to scallop the lip but that's not bad at all.
If you get a welder, get one with DC current. It will make it much easier and a lot less frustrating. You can buy a DC inverter for less than a new tombstone and it's a superior machine. Wouldn't be a bad idea to weld some hardfacing on the bucket lip between the teeth to stop it from wearing any more.