I'm with Dan. I know Weber used to offer a griddle on their Summit series, and it worked beautifully. If they do not offer one for the Spirit another option is to use a large Lodge cast iron pan on top of the grates--this works really well too.
The only downside to the griddle, whether Blackstone or Weber, is that it's a lot tougher to clean than the grates. On the grates (as you know), you can just heat, scrape, and go. The griddle holds the oil, so it can get gunky. it's tougher to clean without hot water
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