What tools do you use to scoop the soap?

If you're committed to plastic, how about a mini-spoon that comes with a cup of Häagen-Dazs?  It's a chance to reuse/repurpose.

It works, ploughs a wide row, and I like the flexibility, but it's short. Also, wood aesthetics are my preference, and at least for croaps, a flat, rather than concave, surface seems more practical.  Knives and spoons might shine for hard soaps that do not cling to the scoop.  Maybe a wooden cheese/soap knife . . .

Post Oak

Crude or rustic, I reckon, and maybe just a popsicle stick with aspirations, but it's another little way to engage more in the experience.

Have used baby spoons occasionally or some of the scoops that have come with soaps at times, usually just brush load from the tub

TRC had some SS scoops and I needed a little purchase to get over the free ship threshold.  I have to say this is much better than the 1/2 clothes pin I've been using for years.

I bought a pound or two of elephant ivory scrap a few years ago before the rules became much stricter (this was represented pre-ban material). My thought was to use it for various craft projects. A number of the pieces are long and thin and have beautiful “bark” from the exterior of the tusk. I polished one of these up a bit and use that to scoop.

FWIW, Mammoth ivory (aka fossil ivory) looks pretty nice and is not subject to any import/export restrictions (as is elephant or marine mammal ivory), given that mammoths died out millennia ago.
Even so, it's surprisingly easy to obtain.

I bought a pound or two of elephant ivory scrap a few years ago before the rules became much stricter (this was represented pre-ban material). My thought was to use it for various craft projects. A number of the pieces are long and thin and have beautiful “bark” from the exterior of the tusk. I polished one of these up a bit and use that to scoop.

FWIW, Mammoth ivory (aka fossil ivory) looks pretty nice and is not subject to any import/export restrictions (as is elephant or marine mammal ivory), given that mammoths died out millennia ago.
Even so, it's surprisingly easy to obtain.

Now there's a song