Shutter: How can I take time lapses with Nikon P900 next to the built-in 10-second programs?

I'm sweating blood to find any product or how to make the time go by with my Nikon P900. It seems to me that my only option is to use the built-in time lapse modes, which sucks. I mean, it shoots at 2MP and the result is horrible. I also tried the interval mode, but the smallest interval is 30 seconds. I simply need a tool to take an image remotely, like every 3 seconds, and then I'll make a video of the separate images. The problem is that I could not find any trigger compatible with P900 that can do this job. I contacted a photographers store and they also said that there is no compatible product for the P900. Can you recommend something to me please?