Yes T101 and T111 sounds correct. At least that is the way I do it.
You are never going to get away from having a nub on the parted off piece. You can minimize it by really slowing down the feed just before it breaks off but it will still be there.
I wouldn't worry about trying to use an angled parting tool. This can minimize the nub but the chip clearing can get dicey because the angle forces it against one side of the cut. Not only can this spoil the surface finish, with some materials the chip welds into the cut and shears the end off the tool holder.
I use Iscar Heli grip. These are very versatile and when they are held in the grooving holder you can turn with them as well. They can give an excellent surface when parting.
ISCAR Cutting Tools - Metal Working Tools - Precision Carbide Metal Working Tools - Metal Cutting Applications
Rigid tapping is nice but you can get by without it. If possible go slightly large on the tap drill size, aim for a 65% thread and make up the strength by user longer thread engagement.