[Help!] How to rename files already renamed?

[vpv]

Sorry for silly Subject...
My challenge is following.

When I import photos I rename them to YYYYMMDD-12345.NEF (20170806-36506.NEF)

YYYY, MM, DD - information from the file - when the photo was captured
12345 - digits from original name (from camera) - _DSC36506
I prefer to use the count information from EXIT, but don't know how to insert it from Nikon D810

For the weddings (and some events) I use modified names - adding HH, MM and SS to the name to make it easier to sort by capture time
YYYYMMDD--HHMMSS-12345.NEF (20170802-122048-33319.NEF)
I use more, that one camera and sync time on them before the shoot.

The issue, that (by mistake) I renamed photos from the wedding using the main name convention - without HH:MM:SS...

How to rename the file from YYYYMMDD-12345.NEF to YYYYMMDD--HHMMSS-12345.NEF
I need to keep "12345" from original files?

Thank you!

[vpv]

I think I have a solution: After YYYYMMDD-HHMMSS- add {File.Name|substr:9}

[Mario]

Problem solved?

[vpv]

Almost 
Thank you for so quick respond!

If I insert {File.MD.Nikon::Main\167\ShutterCount\0} to get count information (*-12345.NEF)
I have something like "20170806-234334-36,202.NEF"

How can I have digits only? Without comma in ShutterCount? Instead of "36,202" - "36202"?

Thank you!

[Mario]

ShutterCount is a numerical variable and IMatch Variables output numbers using your local number format, including thousands grouping and decimal point/comma.
Use

{File.MD.Nikon::Main\167\ShutterCount\0|cast:int}

to output the number without formatting.

Tip: You can try such things out easily in the VarToy app.

[vpv]

Thank you, Mario!
That's exactly what I needed )