Benchkit

A Blockbench plugin and a Minecraft server plugin to facilitate with testing Minecraft: Bedrock Edition skins and entity models.

Usage

This process will become simpler as the plugins become more developed.

Install the plugin on a Nukkit server
Run the server, stop it, and edit the config (making sure to change the key value unless you're just testing)
Launch Blockbench, drag and drop the benchkit.js file into the page (it will import the plugin)
Click the Benchkit menu at the top of the screen and select Connect to Minecraft Server and enter the details (keybind coming soon)
Once connected, go about editng your skin and then click Apply Skin on Server in the Benchkit menu (next time you want to apply the skin to the same player just hit CTRL+SHIFT+L)
Done! Your skin will change in game instantly