As I see it, you need maximum area to keep from pulling a stake from sand.
The Coglahnds ABS stake is about an inch wide, with 9" length. You do the math.
The SMC Sno Stake is also about an inch wide, and gives you the option of attaching a guyline toward the middlw of the stake to reduce rotational force.
The SMC Sno Anchor looks to be the ultimate in terms of square inches. Should be stable as well. They are designed for snow anchorages and while pricey they should be veru difficult to pull out.
All are available at REI.com.
You might be able to fabricate anchors similar to the AMC Anchors out of PVC pipe, or 0.125 aluminum. But then you would have material cost close to the manufactured items.