There's also a Russian chapel in Bad Ems, I believe, erected in honour of Alix... Am I right??
Yes, Bad Ems does have a Russian church.
It was not built in honour of Princess Alix of Hesse (1872-1918), though, but in honour of Alexandra Feodorovna (1798-1860), née Princess Charlotte of Prussia, wife of Nicholas
I. The Church in Bad Ems is dedicated to Saint Alexandra, the wife of the Roman Emperor Diocletian.
Bad Nauheim as one too - inaugurated by Nicholas II. in 1896.
Isn't the Russian church in Bad Nauheim the Reinhardskirche, built in the 1730s as an Evangelical church and used as an Orthodox church only from 1907? Or did you mean the chapel in Bad Homburg?