Speedlite Transmitter ST-E10 Compatibility

[pieshi]

Will the ST-E10 work with my 430ex ii and EOS R?

[jrhoffman75]

The ST-E10 requires the new Canon multifunction hot shoe and a flash with radio (RT) versions. 
If your gear meets these requirements you are good to go. 

[kvbarkley]

The ST-E10 is RF only, so it will not work with the 430EX-II

[JoeySnaps]

It also won't work with the EOS R either, because the R doesn't have a new multi-function shoe to match the multi-function foot of the ST-E10.

It won't work with the 430 EX II because that flash supports optical off-camera control only, while the ST-E10 supports RF radio but not optical.

So, sadly, the answer is No. The ST-E2, if you can find one (maybe used on Ebay?) would do the job for you, though.