What you are asking for is a chicken-egg problem.
While it's technically possible to revolutionize AC/AC with SMPS, driving size, weight and also cost down, just like AC/DC did approximately during 1990 to early 2000's, what you ask for is even more complex than AC/DC was, and the economy of scales isn't playing well, because it's needed in much smaller numbers than AC/DC conversion.
So forget cost as a factor. Depending on number of units, it's going to end up between 10x to 100000x more expensive than the bulky transformer. Of course, unless you do it as a hobby/learning project, in which case you could forget about any standards, as well, right?
Large inverters do exist in power distribution systems, but I guess it's too different from what you require for a small plug-in product.
Sorry I don't know about the standards. The fact you can't find one means it's a real possibility it's such a special corner case niche that there is no direct standard for what you are asking. Then you need to think about which standards are closest.