This is an Unreal Editor header for creating a simple templated details customization to reduce boilerplate.

GenericDetailsCustomization.h

#pragma once

#include "CoreMinimal.h"
#include "IDetailCustomization.h"
#include "DetailLayoutBuilder.h"

template<typename CustomizedType, typename DetailsClass>
class FGenericDetails : public IDetailCustomization
{
public:
    static TSharedRef<IDetailCustomization> MakeInstance();

    virtual void CustomizeDetails(IDetailLayoutBuilder& DetailBuilder) override;

    virtual void LayoutCustomDetails(IDetailLayoutBuilder& DetailBuilder)
    {
    };

protected:

    TWeakObjectPtr<CustomizedType> Selected;
};

template <typename CustomizedType, typename DetailsClass>
void FGenericDetails<CustomizedType, DetailsClass>::CustomizeDetails(IDetailLayoutBuilder& DetailBuilder)
{
    const TArray< TWeakObjectPtr<UObject> >& SelectedObjects = DetailBuilder.GetSelectedObjects();
    for( int32 ObjectIndex = 0; !Selected.IsValid() && ObjectIndex < SelectedObjects.Num(); ++ObjectIndex )
    {
        const TWeakObjectPtr<UObject>& CurrentObject = SelectedObjects[ObjectIndex];
        if ( CurrentObject.IsValid() )
        {
            Selected = Cast<CustomizedType>(CurrentObject.Get());
        }
    }

    if(Selected.IsValid())
    {
        LayoutCustomDetails(DetailBuilder);     
    }
}

template <typename CustomizedType, typename DetailsClass>
TSharedRef<IDetailCustomization> FGenericDetails<CustomizedType, DetailsClass>::MakeInstance()
{
    return MakeShareable(new DetailsClass);
}