Give the modifications a try. If you have enough skill to whittle stuff you can do this.
The file suggestion is the simplest, and it will work fine with no need of power tools if you are only going to do one or two knives at a time. I use a belt sander, but I do a bunch at a time to sell. Her are some pics for inspiration
I whittled this ladle out of birch using this modified Rough Rider Half Hawk, which makes a really good whittler by the way. I did use some gouges for the hollowing of course.
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Here is a before and after shot of a Rough Rider Barlow. The unmodified one is a good knife. The modified one is an awesome whittlin' tool.
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Here is a before and after Taylor Schrade stockman. Again the mods, make this into a great whittlin' knife, which I call the "Cowboy Whittlin' Knife".
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I am quite sure that you can do this. It is almost impossible to mess up using the file. If you have a vise, it will be even easier.
Once you get going on this, it will be like whittlin' - hard to stop!
The file suggestion is the simplest, and it will work fine with no need of power tools if you are only going to do one or two knives at a time. I use a belt sander, but I do a bunch at a time to sell. Her are some pics for inspiration
I whittled this ladle out of birch using this modified Rough Rider Half Hawk, which makes a really good whittler by the way. I did use some gouges for the hollowing of course.
.

Here is a before and after shot of a Rough Rider Barlow. The unmodified one is a good knife. The modified one is an awesome whittlin' tool.

Here is a before and after Taylor Schrade stockman. Again the mods, make this into a great whittlin' knife, which I call the "Cowboy Whittlin' Knife".

I am quite sure that you can do this. It is almost impossible to mess up using the file. If you have a vise, it will be even easier.
Once you get going on this, it will be like whittlin' - hard to stop!