Dr Birchley said greater collaboration with the Welsh diaspora could “really harness the power of this amazing group of people”.
And she called for a “stakeholder meeting where everybody involved meet together at least once at the beginning to align the goals and values on how we can communicate and not lose this valuable resource”.
Dr Birchley said there were more complex issues to address, including tax implications, infrastructure and housing, as well as relocating loved ones.
She called on organisations like Global Welsh, Welsh government, universities and businesses to work together to “really harness the power of the diaspora”.
“It takes everybody getting round the table at least once to be able to look and how to see how their values align.”
A Welsh government spokesperson said: “We have seen excellent examples of where our diaspora can play a key role, not only in supporting and investing in our businesses and communities, but also in showcasing our strengths internationally.
“We are always open to new ways of working with our diaspora and will consider how this insightful report from Global Welsh can help shape future engagement.”