somethng like this you mean?There is a variant of the ESP loader that will host the web site from the SD card. So you can change the payloads at will by just changing the content on the SD card. Any "self-host" pack would work on it. The SD add on was around $9.50 for 5 of them (delivered). You can wire it directly to the ESP (no need for an arduino board) and you don't need to solder anything either, if you don't want to, just use some female to female jumpers. I can post the links to what I got off of Amz if you want? (What post count here on GBA before I can post an external link?)
so the only benefit is that you can use the MSD to write the payloads to unstead of uploading a new .ino everytime you want to change the payload?