Soft, collar-threadable ID tag holder?

Hoping somebody may have an idea.
Quite simply, I'm looking for an I.D. tag (or holder) that attaches length-wise along a collar (i.e., by threading the collar length-wise through the holder), and is made of a soft, flexible material with an insert to hold a tag.
Reason: our local council provide a new tag each year with reference ninfo that can change (so, no hope of using a permanent, engraved tag or specialised, printed collar). Unfortunately, the tag they provide, whilst reasonable (probably) for a large dog, is, IMO, extremely dangerous for a cat. Made of a tough plastic and far too big, it clips around the collar, ends up in a large loop, and is almost guaranteed to get caught on something within minutes of being attached. After losing my little girl, Kîa, in April (yes: she was registered and microchipped; mandatory here), having no tag is no longer an option. However, using the Council tag is useless, even with a good break-away; one just ends up losing the collar and tag!
I'd prefer also to avoid dangling tags that attach to the collar D-ring, partially for the same reason, and also because one is supposed to use the official council tag, which would have no hope of fitting into that type of tag holder without being cut to ribbons.
A holder that attaches length-wise along a collar would be the ideal solution.

A slide-on pet tag is probably what you want. Here's one UK source: http://www.doggiesolutions.co.uk/Agility-Dog-Tags.html There are others. Most of these need to be engraved with the information you want.

There are bags that can be attached to a collar to hold an ID tag but I don't think that's what you're looking for.

LTS3 said:

A slide-on pet tag is probably what you want.

Click to expand...

Unfortunately, all those must be engraved, which defeats the purpose, as the council reference info can change year-to-year. It appears as though a slide-on or thread-on holder may not exist. I'm surprised, since I'd have assumed a clear, soft-plastic holder into which one could put a tag would be a superb idea.
A pity.

I think I understand what you are looking for; I just can't say that I've seen one small enough to fit on a cat collar.  It may be difficult for them to make a sturdy one in a cat appropriate size.  

How about one of those, in which you can put a piece of paper with the info? 

That seems like your best option to me: http://www.zooplus.co.uk/shop/cats/cat_carriers_travel/cat_fashion/51739

I can't seem to find any horizontal tags that are made of soft material for cats...