Pickchars inter-characters

As you'll be aware many websites require characters to be picked from a password and entered with a separating TAB to move between the character entry fields.

Currently this is performed by using:

{PICKCHARS:Password:ID=1, C=1}{TAB}{PICKCHARS:Password:ID=2, C=1}{TAB}{PICKCHARS:Password:ID=3, C=1}

If there was a way to specify an inter-PICKCHARS character then this would simplify it greatly. I was wondering if this could be done by enhancing the existing PICKCHARS Conv option, which currently only has the 'D' option. For example if there was a new 'I' option then Conv-Fmt (or other name) could be used to specify the inter-PICKCHARS character {or characters if possible?).

If this could be implemented then my above example would then become:

{PICKCHARS:Password:C=3, Conv=I, Conv-Fmt=TAB}

In the thread https://sourceforge.net/p/keepass/discussion/329220/thread/e36af5f014/?limit=25#8581 Paul suggested a more flexible solution which may more complicated to implement as it requires embedded placeholders:

I like the idea, but if you are going to allow characters you should allow all characters supported by KeePass using the same form as everything else.
Using the form below allows the other options to remain available.
{PICKCHARS:Password:C=3, Conv-InterChar={TAB} }