Any androgen will help reduce muscle catabolism. I wouldn't bother with MDien, though. I would also start the T3 dose around 25 mcg/day the first day and work up 75 mcg or so over the first week. My Dad started at 50--even though I told him to start at 25--and was very overstimulated. I thought he might get sick. You get used to it quick (over a few days), and that stimulation subsides. If you are going for a cycle longer than 3 weeks, I'd say don't use M1T. Watch your blood pressure if you choose M1T, though.
Your Dad runs T3? Do you two like share gear or what?
Actually, he is on HRT, and I have borrowed a few shots of Test C that he has a script for. He is overweight, so I put him on T3. He wasn't doing it right, so I took it from him before he could do damage. He is 60 years-old with a bad metabolism. I've been giving him shots for ten years now, so I have no fear of needles going into my first cycle.