The concept is to get the wood water hot enough to force more rapid evaporation.
Substantial number of wood carvers do this. Also makes some tough damp woods easier to carve.
For your applications, I'd suggest that you resaw the log into 1" or less thick boards.
Paint the ends to slow down the rate of evaporation.
Stack and sticker the wood, outdoors, under cover, not cooked in a shed, and wait.
The wood will dry down to the Equilibrium Moisture Content of 12% - 14% at about 1" thickness per year.
My western red cedar shake blocks are at least 6" thick. From both sides, that is approx 3 years to dry.
I have piles and stacks of wood blocks and beams, both indoors and out. They dry eventually.
Some of them, I weigh once a year, like a 6" x 24" flawless log of white willow.
I don't think that Holly is tough enough for your apps without a lot of finish protection and that's bound to change the color.
True enough, Holly is about as bright as it gets.