I bought a large Plano Gun Guard case for my old over/under shotgun in 2017 and I’m really pleased with it. It has the “pluckable” high density foam interior. I found a version that looks to be workable here. I’m not sure what the dimensions of the individual foam pieces are but they might be pretty close to what you’re looking for. It’s a pretty big case, (one of the reviewers called it a “tank”) but you could also pack other related items. Here’s a link to the factory page for a pistol case which seems about right for a bunch of WE stones and strops. It’s available on Amazon Prime at this page. Price of $60.79 is the same at both vendors. If the price or the size are out of range, they have a bunch more possible solutions.
This case is pretty close to the tier of the case that WE uses for the Gen3 Pro. Same latches, same robustness.
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