What is another word for if so desired?
Pronunciation: [ɪf sˌə͡ʊ dɪzˈa͡ɪ͡əd] (IPA) 
There are many different synonyms for the phrase "if so desired," which is typically used to indicate that something will be done only if someone wants it to be. Some similar expressions might include "if preferred," "if requested," "if necessary," or "if wanted." Other alternatives could include phrases like "as desired," "by request," "at the discretion of," or "at the behest of." Depending on the context and tone of the situation, different synonyms might be more or less appropriate, but all of these expressions convey a similar sense of flexibility and willingness to accommodate others' wishes.
