Concatenate Column Names From Pivot Table

Pivot Table. I have a large data set and have used a pivot table to summarise the COUNT of each row (Objects) for each Column Name (that is, I did what Pivot Tables do).

What I'd like to do in a new column is show a string of all the column names per row name.

I have a data set that looks like this:

Sheet3

A
B
C

1
Object
Description
Class

[Code]...

So I can pivot table to work with other analysis, but what I'd really like to get is a list of unique "Objects" (easy) with all the related "Class"es listed in column (or straight to concatenated). I can concatenate using Chip Pearson's StringConcat.

Here is an example:

Sheet3

F
G
H
I
J
K

1
Object
Countif

[Code]..

You can see Chip's Function in col K. What I'd like to happen is in Cols H to J be automatically populated. (For this example, I have typed in what I'd like the result to look like)

I considered using Vlookups (with helper column for 2nd & successive instances), INDEX/MATCH with SMALL to get 2nd+ instances and even lengthy IF statements. The main problem with IF is that in the real data set, I can have over 30 Classes.

I looked at Pivot table to see what I could do but haven't much experience in manipulating past regular feature.

I also took a cut&paste of the pivot table (as shown in part below) to see what I could do.

Here is a clip straight from the Pivot Table:

Pivot

A
B
C
D
E
F
G
H
I
J

[Code]..

And one from the cut&paste of the pivot table, which also shows the desired outcome in the right hand column:

Sheet2

A
B
C
D
E
F
G

[Code]...

I would also be fine using VBA, but its been a while since I did any basic coding so I wouldn't really stand a chance of starting from scratch.