I need some help from native speakers who can provide critique of the following practice.
Imagine that someone is called Martin Schneider (fictional example) and is the head of the China department at the ministry of foreign affairs of a European country. As he is regularly contacted by Chinese partners, and v.v., he decides to adopt a Chinese name and picks 马丁, which is just a rendering of his first name Martin with common "transliteration" characters.
While 马丁 is, of course, obviously foreign sounding, it is still a "valid" Chinese name (姓名) since it consists of a valid surname (马) and one other character suggesting a given name part (名).
The question is: Is it stylistically appropriate for someone, especially in a high-ranking diplomatic position, to basically use his first name as his (full) Chinese name? Imagine if Martin Schneider/马丁 meets the Chinese ambassador who is 吴XX. The latter will be referred to as 吴大使 (Ambassador Wu), but won't the ambassador have a strange feeling referring to the host country's diplomat as 马丁先生 (lit. Mr. Martin), especially if he (undoubtedly) understands some English (or another European language), and knows that he's using the host diplomat's first name.
The general reason I ask is because I see this phenomenon of 'first name as Chinese name' among a lot of China focused journalists, "China experts", etc. The more concrete reason is that I need to assess the competence of an actual head of China Dept. in a European country (who is, of course, not named Martin Schneider or 马丁, but follows this 'first name as Chinese name' practice.)
I understand that some Western names (first + last name) are hard to render in Chinese because of complex consonant clusters, and a transliteration like 马丁·施耐德 is neither very imaginative nor easy to type, remember, etc. for a Chinese native speaker. But I find it bizarre for someone to just go by his/her first name as a diplomat.
Note: I understand that this question can't be answered in an exact way, please suggest edits, or other possible ways to find a solution.