I highly recommend to you to post your question on the Bogleheads forum [1], specifically within its "Non-US Investors" category/sub-forum. There is a lot of expertise in that forum regarding international investing in general & focus on maintaining a simple, efficient index based portfolio with low costs. You may also find their wiki [2] page on Non-US investing useful.

[1] https://www.bogleheads.org/forum/index.php [2] https://www.bogleheads.org/wiki/Outline_of_Non-US_domiciles