I'm glad you found the 26 oz M43. I was going to post that the 18 inch M43s come as light as 28 oz, but you did even better. The larger lesson is that every model of HI blade comes in a variety of weights (and lengths), since they are hand made with traditional methods. Sometimes the end-weight just depends on which piece of steel the kami picks up, since thickness varies, fullers can be deeper or more shallow, etc. I don't know if you've been going by what is posted at the HI online store, but that is mostly an archive -- doesn't have all the models, and doesn't show the great variety of weights for each model. This forum and Yangdu's Deals Of The Day is where all the good stuff is found. Or you can email Yangdu any time if you have questions or want a particular model. Some models and sizes are available often, and some are much less frequent. You can also request a special order from Yangdu, but that usually involves a substantial wait.
If you decide to get one of the super-heavy models (AK, Bonecutter, GRS) and the weight is too much, consider getting a 15" version instead of 18". It will weigh less and the center of gravity will be closer to your hand. A 15" version will be good for just about anything except chopping down a big tree, and even that if you're very patient.
I have a couple of kardas that I keep sharpened for small tasks around the house. I sharpen them with a fine file. There is a huge difference in size among kardas. The really small ones aren't good for much unless you have very small hands or need a nail file. The larger ones can be quite useful, as long as you can get enough of a grip on the handle. I'm talking about the kind of karda that often comes with a khukuri and fits in the same sheath. There is also a much larger version called a Kumar Karda that is a standalone knife with its own sheath. Those can be as large as 14" or even more in my experience, and some of them have fancy carved or checkered handles.
Here are pics of two Kumar Kardas. The first one is by Bura Kami, 13" overall length with a carved handle made of Chandan wood, which is now a protected species that can't be exported from Nepal. The knife was made before the wood became protects. The second is by Sher Kami, 15.5" overall length with an unusual handle shape (for a Kumar Karda) and blade curvature.
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