I also think that as long as work out does not affect the pull of ADS there should be no problem. The problem is this is NOT like this in reality, working out will surely affect the tension of your ADS, so both work out and ADS pull will suffer. This is why I decided to separate the two, work out in the morning, then PE after lunch.
I just restarted PE after a month and a week of decon break, I started very light vacuum hanging with 1,2kg and am wearing ADS with constant heat pad at low. So far vacuum hanging feels very comfortable.
For starting weight, there is no consensus and most people start too high which is clearly not good as you will soon condition your unit and be forced to go for extreme weights. Time and constant heat are much more important factors than big weight. I read here about a guy who grew like crazy starting with minimum weight something like 50g and worked his way up to 1.5kg. Most may not grow at all with such low weight, but I believe in starting low anyway, so I will slowly work my way up from 1,2kg.