I know they're a lot of work to make, and more to dry, but it somehow seems do-able work, doesn't it ? Something that can be done bit by bit as materials come to hand and the weather's reasonable.
I know from friends who burn them that they are best used as a adjunct to normal fuel. Much like our parents generations used briquettes to keep a fire glowing all night without burning expensive small coal. We had neighbours who used to wrap up the vegetable peelings in layers of newspaper and pack that at the back and sides of the fire. It burned long and slow. Didn't smell (though smoke went right up the chimney, so we didn't smell it really anyway). I don't know what all that kind of soot does to the crud that collects inside chimneys or flues though
What does burning wax do inside the lum ? does it make it a mess that needs cleaned out more often ? If not, I think I'd collect all the scraps, from cheeses and candles and use that in my mix too.
I make up old fashioned faggots to burn at camp. Small sticks, prunings from the fruit trees, gathered heather, mugwort, winter stems from meadowsweet, reeds, bog myrtle, etc., and tie them up tightly.
They don't burn quite like a log, but by binding them together, and they dry bound, they do take a lot longer to burn than if the stuff was all loose and put into the fire.
Those might very well be do-able for you too
I craft stuff through the year, my scraps of everything from fungus to barks go into either tinder bundles or into the faggots.
Several years ago I posted a thread on tinder bundles, it's a good time of year to revisit it I think
https://bushcraftuk.com/community/index.php?threads/tinder-bundles.135268/