"unShared" Custom props for new cards?

[Sivakatirswami]

I'm keeping a set of songs, about 70 in a small data base, each one  
has it's own card, and has several versions in r fields, Original  
Tamil, English transliteration, literal translation, prose  
translation, Lyrical Song version.

Now, I'm wanting to keep some other versions as well, but it's  
cumbersome to show these.. right now I have five fields  set up has a  
horizontal series in a group with a horizontal scroll bar... Only two  
fields can be viewed at at time.. and I have a "hoist" feature which  
moves one field to the front position... it's all a bit "wonky" (?)  
but it works.  These get exported to XML files and then imported into  
Indesign for printing...I'm realizing that if I "take the plunge" to  
storing data in custom properties that suddenly a lot  of the display  
issues are simplified. just present the different versions data in  
the custom props into "generic" the two visible display fields. This  
allows for extensibility with adding and programming for, more fields  
in the UI.

But if one adds a set of  custom properties for the various versions,  
it has to be done for each card. If you set a custom property to a  
background field that holds different text on different card, the  
custom property persists... i.e. it is a "shared" custom property for  
that field for all the cards. if I edit the  text of that  prop, it   
is  also edited for the same field on all the cards. edit the custom  
prop "uTestText" of fld "English"  on card 1 and your edits appear in  
the "uTestText" of fld "English" on cards 2 through 70...even though  
the fld content of fld "English" is different on all the cards. This  
makes perfect sense of course.

So, the question is... is there some way to set up some kind of   
custom prop set, such that when you do "create card"  the new card  
will have  those custom props generated  automatically, but which are  
empty and  unique to that card? I realize the work around would be to  
write a script to adds the custom props to  all the existing cards  
and then trap the create card handler in the future and cause it to  
do a "clone card" instead and then clean out all the data in the  
fields  and custom props of the newly cloned card... this would  
emulate a kind of "background custom property set" that is "unshared"  
but the same across all cards.

but before I go ahead with this... I was just wondering if I missed a  
feature on the vast ocean of Rev's syntax that might allow for  
setting up such an "unshared" background custom property set whcih  
becomes, like,  part of the placed background that is auto added to  
new cards.??

TIA
Sivakatirswami