Hello strict,
If you can get the stainless steel wire 1.2mm, you DIY a 7.x Costar wire.
Here is what I tested on while ago when I was waiting for a case GB.
I tested on stainless steel wire 1.0mm, the tools that I used are :
+ a pair long nose pliers to straighten the wire by twisting the two ends.
+ a flat nose pliers to bend the corner, it is very effective in this case.
+ a heavy duty cutting pliers to cut the stainless steel wire
* the middle is the DIY 7x Costar wire. It is imperfect but I believe we can tune it up depending on how picky we are. Note that the costing for doing this is very cheap (5m of 1.2mm stainless steel wire is only about 0.25 USD)
Hope it can help