Just spoke a nice lady at Venhill and she is going to create a new kit, specially for FZS1000 owners as a permanent fix.
The reason I did this was because the kit mentioned in the OP has solderless nipples at one end (these would be used at the servo end) and cast nipples other end (takes the heat at the exup vale end). This type of kit is a 'get you out of trouble, not design as a permanent fix', because the grub screw method isn't the strongest and the cable can pull out of the nipple over time.
And because the kit above uses stainless steel which cant be soldered-to, my initial idea of changing the grub-screw nipple for a brass solder-able one would work. So she explained that what I need is a kit that comprises of "A nickel plated steel cable with a cast nipple at one end, and loose brass solder-able nipple at the other".
She will be emailing the new product code & web link which I will then post on this forum. The above kit is as strong as the stock cables, because I just repaired an FZS1000 throttle cable with a similar kit and did a pull test. With two pliers and all my strength, it was rock solid.
Result.