If you go with the 2 anchors theme, the idea is to have a continuously looped line, between the one inn the water
& the one on the beach. So that when you want to board the dink, you just pull her ashore using the lline.
And from what I gather, many who go this route
, use one of the screw in anchors, on the beach end.
Albeit the weight of 2 anchors, plus the tackle to go with, & a skid plate on the dink will wind
up weighing more than wheels.
Is the dinghy weight thing an issue when lifting it aboard, or something else? I ask as I'm not getting where you're trying to cut weight or why. Especially since, with the proper wheels, they'll make moving the dink up & down the beach a fair bit easier than would a skid plate.
Ah, & have you considered adding handles to the dink's transom? As in real handles.
They're another of those "little things" which make handling dinghies a lot easier.
PS: You can use a fender
(or trio of them) as rollers, underneath of the dinghy, to assist in moving it up the beach.