Best practise would tell you to support the join with a stump. However...at this distance...one could argue that bolting the existing bearers together would be sufficient.
Another option is to fit a new section that spans across both existing stumps and is then bolted to both existing bearers...thus offering potential to transfer the load back to the stumps rather than loading the join. It's just a bit more of a fiddle but a lot less than installing a new stump.