If you mean URL Redirect pro, then yes you can add more custom sites, see below screenshot, if you click on that option it will show you the format to use:
Many browsers will continue to point to the local Google TLD for a while,.
And, even once there are redirects to Google in place, as stated in the article you link to, does that necessarily mean that the Local Google redirects many use will stop working completely?
From what I know, some tools do let you add multiple Google redirect links and also let you customize the slug part. It really depends on which tool you're using though. If this one doesn’t support it directly, maybe there’s a workaround or an update coming. Have you checked their FAQ or support? Sometimes they have neat tips on that.
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If you mean URL Redirect pro, then yes you can add more custom sites, see below screenshot, if you click on that option it will show you the format to use: