Yes!
I already have some games published there using Construct 3 with C2 Runtime. (That is why the client came to me). And knowing that the C2 will be retired is why I'm asking about how to disable (if possible) the WebAssembly, because after July, even my published games will not be able to be updated.
I can't think on future versions of KaiOS at the moment as a large number of devices probably will not be updated. Thus, making games that does not work on them will drastically decrease the game's audience.
Thanks for your help!