I know a few families who've done this lah, and honestly the format varies depending on whether you register at the mosque or KKH first. My friend's daughter is registered with her Muslim name officially, then they added the Chinese name on the birth cert as a second name when they registered with ICA, so it reads like "Nur Ain Lee Chen Wei" on the documents. Some families do the @ symbol thing you mentioned, but from what I've seen, the cleaner way is just to include it as a proper middle or second name so it flows better and causes fewer headaches with school forms later on. Best to check directly with the registration office (whether mosque, KKH, or ICA) about what they'll accept, because the officers can sometimes advise on what works smoothest for your situation.
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