As long as he's not eating any dry food and you are monitoring him at PS and a couple other times each cycle, I don't see any reason why you can't do TR.
Thank you for being willing to add his food to his SS. It will help you and us. And as a note, feeding is not a "one size fits all" concept. It takes some experimentation, sometimes, to figure out the best feeding strategy to fit his curve, his hunger, and your schedule as well as the other cats.
There are some cats, like Chase, who definitely benefit from food management of their curve but others who really don't need it quite so much and Angel might be one. We will have to see. But it might just be that you can free feed him when he's hungry before nadir and then find a way to be sure he doesn't get too hungry towards the end of the cycle and provide something small and LC doesn't impact his duration.
It's very important to remember that Angel is a long-term diabetic because it's been more than a year since he was diagnosed even though he went into remission. Once a diabetic, always a diabetic but those in remission are insulin independent and controlled by LC diet.
It's also important to note that when a cat comes out of remission, we need to be a little more aggressive in getting them back into remission. That's where shooting any number above 68 on your AT provided you have supplies and are available and able to test becomes important. Once a member has some data and experience, stalling, shooting reduced doses, and skipping are more for the member than the cat

. And that's ok......if we are sick or have other important obligations, sometimes it is necessary to stall, skip, or shoot a reduced dose.
However, by and large, the more you are able to shoot a consistent dose about every 12 hours, the better for Angel. Again...keeping in mind the safety factors of only shooting above 68 (AT) and being sure you are available and able to monitor if you shoot green numbers. As you can see with Chase yesterday, sometimes the BG really flattens out and less testing is needed.