Dude!! Wait it out. Bottle conditioning takes a least 1 week usually 3 weeks. Very unlikely it would be carbonated after 5 days!!!! 3 weeks at 70c is normal!!! Don't even think about tossing it!
Hi, I live in Wellington too and started brewing this year using the biab method. I think there are quite a few homebrewers in the wellington region! The Brewhouse in Newtown has a lot of supplies and they are very helpful. If you don't know already Hashigo Zake import some fresh American craft...
Generally it's not a good idea to gather yeast from the secondary as you will be selecting the least flocculent yeast which could change flocculation patterns in subsequent generations. If your using a bucket depending on the yeast strain top cropping the yeast 48-72 hours into fermentation...