PowerQuery case sensitive workaround

Hi, 

I'm trying to use a workaround for PowerQuery being case insensitive but had a bit of trouble implementing it. The workaround adds an invisible character next to each lowercase character. https://blog.crossjoin.co.uk/2019/10/06/power-bi-and-case-sensitivity/

In the example, a new table is made from the source data. I would like to just add a new column to my current table that copies my Street Order ID and adds in the invisible characters. Here's the code I have so far:

ToList = Table.AddColumn(Source,
"CaseSensitiveStreetID",
each Text.ToList([Street Order ID])
),
LowerCaseChars = {"a".."z"},
AddInvisibleChars =
Table.AddColumn(
ToList,
"AddInvisibleChars",
each
List.Transform(
[CaseSensitiveStreetID],
each
if
List.Contains(LowerCaseChars, _)
then
_ & Character.FromNumber(8203)
else _
)
),
RecombineList =
Table.AddColumn(
AddInvisibleChars,
"OutputText",
each
Text.Combine([AddInvisibleChars]),
type text
),

RemovedOtherColumns =
Table.SelectColumns(
RecombineList,
{"OutputText"}
),

However, this does not add a new column 'OutputText' to my table. What am I missing?