that’s a valid approach when I checked. Either
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export all, edit the .vcf file in an editor where you’ll see when the addressbook is rolling over in the file to the internal one. Delete the upper part. Worst case convert vcf 2.1 format to v3 or v4 (online) and reimport. Or approach
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without file editing, select the device addressbook, long-press an entry, select the checkbox to the right and subsequently every other 92 times. Share to yourself by Email or what you prefer. Again probably convert to higher .vcf version depending on where you import, on murena.io or on the other Android device local.