Hi,
I'm a BI/DWH expert from Bulgaria (EU) with 7+ years of experience in that field.
Over the years I've gained hands-on experience in wide variety of tools:
a. RDBMS - Oracle, Teradata, MSSQL Server, MySQL, PostgreSQL and a few others.
b. ETL - Pentaho Kettle (PDI), SQL Server Integration Services (SSIS), Oracle Data Integrator a.k.a. ODI,
c. OLAP - Mondrian, SQL Server Analysis Services (SSAS)
d. BI Servers - Pentaho BI, SQL Server Reporting Services (SSRS)
I think my ETL skills could help you a lot in this "migration adventure", only If your system is well documented and you have good understanding of the Confluence back-end.
Looking forward for your reply!