There isn't one exactly like ours, afaik, but there are a couple of upcoming ones that you may be interested in.
For one, I do know that the Guardian novel is eligible for Yuletide this year! So if you have a couple of other fandoms you'd be willing to offer/receive (for example, Lost Tomb, Time Engraver, and ZhuBai RPF are also eligible and in the Yuletide tagset this time, I believe) you could sign up for Yuletide. No guarantee that you'll get matched on the novel in Yuletide, of course, but you can make it one of your offers/requests and aren't required to have the drama as any of them, unlike the Sundial exchange. (In fact, the drama is no longer eligible for YT this year.)
Another is the 520 Exchange that sid_guardian runs, though that won't start until late March next year. For that one, the participants post what they're willing to create and you choose three 'offers' that you're interested in, and will be matched to one of them. Since you get to choose the offers that you want, you'll be able to curate and select only novel offers. Just make sure you're ready when the offer choosing goes live, since offers are removed from the list after a certain number of people request them. The earlier you make your list of requests, the more choice you have.
You might also ask around on Twitter. There seem to be parallel fandom tracks for Guardian, with those who love the novel, those who love the drama, and some overlap between them. While I don't know of another exchange exactly like ours, right now the Zhenhun Big Bang is going on (https://zhenhunbigbang.carrd.co/) and Weilan week is coming up in Novemeber (https://weilanweek.carrd.co/). I have no idea who is running either of these events, but they both seem to be novel-friendly.
Finally, if you don't completely hate the drama, you might still consider signing up for the Sundial exchange. Last year we were able to match people's first choice of request fandom in every single case. And plenty of people request multiple fandoms, so there's a good chance that you'll get matched to someone with multiple creation options to choose from. But if you're uninterested in receiving or creating for the drama under any circumstances, that's understandable! In that case, one of the ones listed above would probably work best for you. :)
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For one, I do know that the Guardian novel is eligible for Yuletide this year! So if you have a couple of other fandoms you'd be willing to offer/receive (for example, Lost Tomb, Time Engraver, and ZhuBai RPF are also eligible and in the Yuletide tagset this time, I believe) you could sign up for Yuletide. No guarantee that you'll get matched on the novel in Yuletide, of course, but you can make it one of your offers/requests and aren't required to have the drama as any of them, unlike the Sundial exchange. (In fact, the drama is no longer eligible for YT this year.)
Another is the 520 Exchange that
You might also ask around on Twitter. There seem to be parallel fandom tracks for Guardian, with those who love the novel, those who love the drama, and some overlap between them. While I don't know of another exchange exactly like ours, right now the Zhenhun Big Bang is going on (https://zhenhunbigbang.carrd.co/) and Weilan week is coming up in Novemeber (https://weilanweek.carrd.co/). I have no idea who is running either of these events, but they both seem to be novel-friendly.
Finally, if you don't completely hate the drama, you might still consider signing up for the Sundial exchange. Last year we were able to match people's first choice of request fandom in every single case. And plenty of people request multiple fandoms, so there's a good chance that you'll get matched to someone with multiple creation options to choose from. But if you're uninterested in receiving or creating for the drama under any circumstances, that's understandable! In that case, one of the ones listed above would probably work best for you. :)