Line lock or leave as is?
I get the idea of a two step but that would be one more thing to add for just those couple of track trips a year. I don’t run a rev limiter at all at the moment.
I agree though that it will take some practice to find and be consistent with a launch rpm that works best.
A rev limiter might save your engine, I highly recommend one.
The A833 and period shifters are not known for their stellar performance, , especially on the 2-3 shift. If you get your shift-timing off,(hand/foot co-ordination) it's all too easy to miss the window, and with your foot back on the gas, 7000PLUS rpm may come.....and may go. I have seen the needle coming back down, falling past 8000; so obviously it was higher than that at one time,lol.
This can be a double whammy heart attack for your engine.
Firstly, the stock oiling system is not set-up for that, and you may loose a rod bearing or two.,and
Secondly, your valve spring pressure may be insufficient, and the lifters can loose contact with the cam.....and pump up....... and will attempt to drive the valves into the piston-tops.
Now 7000 rpm is ~116 revolutions per second. A regular shift may cost you up to .2 second. When you botch it, it'll be awhile before the revs fall below 6000.Your foot will come off the gas pedal, the car will be slowing, and the synchro is doing it's best, but no matter how hard you try, you will be scrambling to figure it out. So let's say it takes just a half a second for things to come back into focus. 1/2 second is therefore 58 revolutions.
This is a lotta revolutions of uncontrolled valvegear action. Certainly enough to do some damage, depending on how the engine was built.
In comparison to that damage, a rev-limiter is cheap.
The rod bearing damage may not be evident on the first over-speed. You may not hear it until the next pass......... or until the drive home.