I know this is an old question but I happened to come upon this question while struggling with the same issues as the OP.
Not having found any of the offered solutions a viable option, I set out to discover if there is a way to do this just using Excel.
Fortunately, I have found that the lost character issue only happens (in my case) when saving from xlsx format to csv format. I tried saving the xlsx file to xls first, then to csv. It actually worked.
Please give it a try and see if it works for you. Good luck.
