I don’t know how deep your knowledge is regarding python, but I’m shure you could build your own Data.ExportCSV node via python like @GavinCrump did here with exporting data to excel here:
If you have a look at the code on github you will see that you should be able to create your own method and replace the “,” with an semicolon “;” or anything you want:
public static class Data
{
/// <summary>
/// Write a list of lists into a file using a comma-separated values
/// format. Outer list represents rows, inner lists represent columns.
/// </summary>
/// <param name="filePath">Path to write to</param>
/// <param name="data">List of lists to write into CSV</param>
/// <search>write,text,file</search>
public static void ExportCSV(string filePath, object[][] data)
{
using (var writer = new StreamWriter(DSCore.IO.FileSystem.AbsolutePath(filePath)))
{
foreach (var line in data)
{
int count = 0;
foreach (var entry in line)
{
writer.Write(entry);
if (++count < line.Length)
writer.Write(",");
}
writer.WriteLine();
}
}
}
But here ends my knowledge, as I am able to reference/use methods from the api in python, but recreating things like gavin did in the topic mentioned above is above my skill level 
This does not solve your problem of getting commas as a decimal seperator for shure, but at least you can work with the csv then. In excel you could either way use the legacy import of csv’s where you can choose the delimiter or you could create and run a batch-file to replace every comma for a point and then replace every semicolon for a comma.
If you need a batch file that can do this, I can provide it, as I have already been in need for such a batch file before.
EDIT#1:
Thanks to ChatGPT this does create a csv with the delimiter you want:
import clr
import System
clr.AddReference("ProtoGeometry")
clr.AddReference("RevitAPI")
from Autodesk.DesignScript.Geometry import *
from Autodesk.Revit.DB import *
from System.Collections.Generic import List
def export_csv_file(file_path, data, delimiter):
csv_str = ""
for row in data:
for i, val in enumerate(row):
if i != 0:
csv_str += delimiter
csv_str += str(val)
csv_str += "\n"
System.IO.File.WriteAllText(file_path, csv_str)
""" Example usage
data = [["Name", "Age", "City"], ["John", 25, "New York"], ["Jane", 30, "Paris"], ["Bob", 40, "London"]]
file_path = "C:\\Temp\\data.csv"
delimiter = ";"
"""
data = IN[0]
file_path = IN[1]
delimiter = IN[2]
export_csv_file(file_path, data, delimiter)
