My car-key broke off my key-ring.

[![enter image description here][1]][1]

The small loop at bottom right of photo is broken.

How can I fashion some method of securely attaching this to a key-ring?

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Followup to ErinGoBragh's comment:

<strike>The key (or more accurately the transmitter housing) can't easily be taken apart</strike>, the battery is accessed by turning a screw to unlock a battery holder that slides out. <strike>I suspect the plastic is glued (or maybe solvent-welded) together.</strike>

[![enter image description here][2]][2]
[![enter image description here][3]][3]
[![enter image description here][4]][4]

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After ErinGoBragh's comment and Tetsujin's answer I dug around a bit more assertively ...

[![enter image description here][5]][5]  
[![enter image description here][6]][6]
[![enter image description here][7]][7]

Maybe there is some way to make a replacement for this small loop with its cruciform anchor-foot?

Note: I'm after a simple hack, preferably one that will hold up for a few years. I'm NOT looking for "as new" (though maybe I could cannibalise something off eBay?)

  [1]: https://i.sstatic.net/ZmamE.png
  [2]: https://i.sstatic.net/o3tTh.png
  [3]: https://i.sstatic.net/EbSQP.png
  [4]: https://i.sstatic.net/xAtWA.png
  [5]: https://i.sstatic.net/UA33k.png
  [6]: https://i.sstatic.net/E66b7.png
  [7]: https://i.sstatic.net/h4txY.png