Powershell Import-CSV: either reorder columns with no headers or export-CSV with no header

Question

I have a CSV file with no headers in which I need to add a column between the first and second column. I ultimately want to export the file with no headers to the same file name (hence why I'm using Import-CSV vs Get-Content).

Here is the script which adds the new column to the existing file:

(Import-CSV U:\To_Delete\Layer_search\WB_layers-mod.csv) | 
Select-Object *,@{Expression={'FALSE'}} |
Export-Csv U:\To_Delete\Layer_search\WB_layers-mod.csv -NoTypeInformation

This adds the a new column as a third column. In doing my googling, I could find no way to reorder the columns without having a header row, so I modified the script as follows:

(Import-CSV U:\To_Delete\Layer_search\WB_layers-mod.csv -header H1, H2)| 
Select-Object *,@{Name='H3';Expression={'FALSE'}} |
Select-Object -Property H1, H3, H2 |
Export-Csv U:\To_Delete\Layer_search\WB_layers-mod.csv -NoTypeInformation

This puts the columns in the correct order, but now I want to export the CSV without the header row I added. However, the only suggestions I'm finding are using Get-Content, Convert-to-CSV, and using Skip 1. That won't work for me because I'm only running PS3 and that option is not available until PS5, and I want to save back to the original file name, which you can't do with Get-Content.

I'm probably making this a lot harder than it needs to be, but I would appreciate any suggestions.

Thanks!

Edited to add:

For clarification, here is an example of the CSV file I am importing:

abc,1/1/2012
def,1/2/2012
ghi,1/3/2012

I want to add a column between the first and second columns:

abc,FALSE,1/1/2012
def,FALSE,1/2/2012
ghi,TRUE,1/3/2012

Hopefully this makes more sense.

Answer 1

I'd read Headers H1,H3 and calculate H2 to have them in the proper order directly.

(Import-CSV .\sample.csv -header H1, H3)|
  Select-Object H1,@{Name='H2';Expression={'FALSE'}},H3 |
    ConvertTo-Csv -NoTypeInformation | Select-Object -Skip 1 | Set-Content New.csv

Sample output

"abc","FALSE","1/1/2012"
"def","FALSE","1/2/2012"
"ghi","FALSE","1/3/2012"