Storing Cashier information in separate, related model: Users > UserPaymentMethod

I know that Cashier lets you set up which models are used by the package, but I don't seem to fully understand if what I am trying to do is possible.

Really, all I am trying to do is store the Stripe Customer information in a separate table, while also still relating it to the User model, for instance:

$user = User::find($id);
$paymentMethod = $user->defaultPaymentMethod;

where the defaultPaymentMethod is defined as:

public function defaultPaymentMethod()
{
    $this->hasOne(UserPaymentMethod::class)->where('default', true);
}

So, any given $user is a stripe customer, but they have multiple payment methods saved in the table of the UserPaymentMethod model. Because Stripe can return a payment method ID for each method saved for the customer, I would store the stripe_id and the stripe_payment_method_id in the UserPaymentMethod.

I still want to be able to do $user->createAsStripeCustomer($options); and have that functionality, but save the results on the UserPaymentMethod model, not in the User model / table.

My UserPaymentMethod:

class UserPaymentMethod extends Model
{
    use Billable;

    protected $table = 'user_pm';

    protected $guarded = [];

    protected $casts = [
        'default' => 'boolean',
    ];

    public function user()
    {
        return $this->belongsTo(User::class);
    }
}

my User model:

class User extends Authenticatable implements \Spatie\Onboard\Concerns\Onboardable
{
    use HasApiTokens,
        HasFactory,
        Notifiable,
        HasRoles,

    protected $fillable = [
        'name',
        'email',
        'password',
        'uuid',
    ];

    protected $hidden = [
        'password',
        'remember_token',
    ];

    protected $casts = [
        'email_verified_at' => 'datetime',
    ];

    public function defaultPaymentMethod()
    {
        $this->hasOne(UserPaymentMethod::class)->where('default', true);
    }

    public function paymentMethods()
    {
        return $this->hasMany(UserPaymentMethod::class);
    }
}

Any thoughts?