You can make your own graver,,lots of people do and do fine work with them.
Thats what you are doing when you make one from a lathe tool blank as well. It's just a piece of hard steel.
Use a file if you want.
A friend of mine uses slender stone carving chisel points. They are tapered so the hammer end is wider. The tip he takes down even further of course to make his graver point.
No extra handle,,just the tapered steel stone point chisel. Says he gets them from Italy.
Whatever works..
Wasting money on tools and techniques...
Buying lots of tools that you don't need would be a waste,,you only need a couple to complete most any job. One will actually do, That being a V chisel,,choose your favorite angle.
A liner or two may be useful on some patterns for accent and shading. I don't know if it shows up that often or at all on L/R's. Those Liner gravers would have been something the gunsmith/engraver of that time would have obtained commercially,,but they were common in the trade in Europe as were dozens of gravers in other sizes and shapes.
Techniques are either good or poor.
Your work quality will show which.
You can buy all sorts of specialty equipment but it won't make you into a good/great engraver.
Some of it will make things easier,,like the sharpening equip. That is one thing where many new engravers stumble,,sharpening/resharpening a graver.
Repeatable sharp point on the tool by simple hand held graver being sharpened against a stone. It's tough to do but not impossible. That's the way it was done.
When I started, that was the method.
A 'Crocker' could be used but they were slow to set up each time and the free hand method was encouraged.
Then the power equip came along with it's clamp fixtures to ensure angle repeatability.
Really does a nice job.
I got my power hone sharpener when I was forced to use carbide gravers that was in the later 90's. Diamond cutting plates were necessary to use with the carbide. Plain stones were useless.
I was 30yrs into engraving at that point and had only sharpened by freehand on a flat stone up to then.
For the simple work on a ML,,a hammer and chisel is fine.
Be proud of your work. Do the best that you can.
Don't fall back on the 'They all did crude work on those old guns' excuse.
They did the best that they could... and were proud of their work.