On my old boat, which I built like you, a ClarkCraft 20' Mariner fish and ski that I had a slant 6 in. I use to use something like this to chunk bass in the rocks of cohasset that had lots of ledges.
https://www.basspro.com/shop/en/chene-anchors
Because I lost a couple that I couldn't get out.
Also didn't spend allot of money on expensive anchors. Now will these cheap anchors hold in a good blow, probably not but when just using to fish an area it worked for me.