Here is the solution to getting the value from an EpiCurrencyConver.
Credit to @hmwillett in this post.
using System.Reflection;
EpiCurrencyConver currencyConver = (EpiCurrencyConver)csm.GetNativeControlReference("ab42f185-a704-4680-b8c6-7ce33892a032");
private string getCurrencyConverValue()
{
EpiCurrencyEditor reflect= (EpiCurrencyEditor)this.currencyConver.GetType().GetField("currencyConver",BindingFlags.GetField | BindingFlags.Instance | BindingFlags.NonPublic).GetValue(this.currencyConver);
return reflect.Value.ToString();
}