If you’ll move back to your home country again, it makes sense to sell your assets before moving (because Switzerland has no capital gain tax for individual investors) and invest them again after you move - tax savings can be gigantic. In that case, it doesn’t matter which fund you picked in Switzerland, as you’ll have to build a new portfolio in your country.
There’s no risk - it doesn’t matter in which currency you buy the fund because the underlying assets are bought in different currencies anyway (for VT about half is USD). It just adds cost to your fund, as the fund manager first has to convert your EURs to USDs to buy the stocks, and then do the opposite when you sell.