What you want to do is actually what counts. This is not what I am recommending, but as it happens, I have simply stated the following. Just a background (my contribution may or may not be reliable). I have been a model engineer (well, this is important as people from and industrial backgrounds usually have a different opinion) for quite some years. I recently bought my second, much larger lathe. I had in the past been using a Myford and it took 8mm shank inserts but the now looks somehow small in the new machine. So I have chosen the 12mm shank. SCLCR +SCLCL right hand and left hand general purpose tools. When using the smaller 80deg angle, these take the almost square CCMT inserts/tools. Compared to the DCMT inserts which have a 55deg angle, these ones are relatively stronger and cannot chip easily. I have got a tool which takes the DCMT. I however prefer to use it for finer and finishing work where the percentage of getting any damage is very small. My expectation is that I will use the SCLCR as my main workhorse turning tool given its ability to turn and face with no adjustments while the SCLCL will mainly be used for the “odd back edge of a shoulder” operations.
The SCBCR RH rough turning tool uses the CCMT insert, but the 100deg angle. It is possible to use the other inserts that had previously been used, chipped or worn from other tools. Rough external turning, but it cannot work up to the shoulder.
I get the external cutting threading tools which take 16ER inserts, both the 60deg and the 55deg as I require both the metric and the imperial threads. I also putt in to use a parting tool which takes GTN-2 inserts.