My view is contrary and in agreement with the comments above at the same time.
You are ready for the gym as you are taking yourself there, true Aussie grit. I love and associate with your attitude. I went down the route you are at diagnosis with walking and weights - it killed me at first, but I pushed through and obtained non-diabetic numbers....However with the benefit of hindsight this is what I would do given my time over with your motivation levels (and if you are prepared to push through):
- Keto eating regime (it is true diet is the most important aspect, at circa 80 - 85% of the effort)
- Eat twice a day on either a 16 / 8 or 16 / 6 (this gives a lot of fat burning time and can lead to OMAD)
- Walk for 10 minutes after each meal
- Sleep as well as possible (aids repair, reduces the cortisol of the exercise, improves insulin sensitivity and is when fat loss ramps up)
- Gym
- Light weights with excellent form (this is more important than weight, don't over do it)
- Walking
- Varying is good such as inclines rather than just steady state (no requirement for running)
If you are a little insane then adding the additional training element will yield further results such as increase lean body mass, additional calorie burn, endorphins and sets you up well for your potential phase 2, when circa 30 kg has come off. On the other hand if you are struggling the majority view of diet only and perhaps walking can get ridiculously good results, and as the weight comes of exercise becomes easier.