odkmeta will automatically detect repeat groups in your XLSForm and will add merge and reshape commands to the do-file. In other words, you don't need to specify anything extra for odkmeta to work with repeat groups. If you do run into issues, there are some threads on the forum related to odkmeta and merging that may be helpful. (odkmeta certainly does not require you to be a Stata expert, but it may require some troubleshooting.)
Hope that helps!