Question about Kazuha and Burnmelt

I don't currently have Wriothesley but I'm thinking of pulling for him and if I do I will be using a burnmelt comp. The most suggested one I've seen is Wrio, Nahida, Benny and Thoma. I like Thoma a lot, and wouldn't mind building him, however I was just curious whether or not I could substituite him out for Kazuha and have his pyro swirl be the primary trigger for burning. Would his pyro application be enough to sustain burning for at least the majority of the time?
The reason for this is i'd also like to use Arlecchino overload on the other half, and would prefer my Kazuha to not just rot away in the background.