Hi Maarten I have 1 idea but I don’t know if it will work
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Download https://cometpowered.com/ VeChainThor Browser Extension
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Export Metamask ETH Private Key
https://metamask.zendesk.com/hc/en-us/articles/360015289632-How-to-Export-an-Account-Private-Key -
Add ETH private key to Comet wallet