How to modify override price in vmCustomPlugin?

[MikUrrey]

Hi all!
This is calculation method in my custom plugin:

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public function plgVmCalculateCustomVariant($product, &$productCustomsPrice,$selected){
if ($productCustomsPrice->custom_element !==$this->_name) return ;
$customVariant = $this->getCustomVariant($product, $productCustomsPrice, $selected);
if (!empty($productCustomsPrice->custom_price)) {
if (empty($customVariant)) {
$productCustomsPrice->custom_price = 0.0;
}
}
return true;
}

If product has override price this method not works, because calculationHelper::getProductPrices not allows this.
I try to write this:

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if (isset($product->product_override_price))
$product->product_override_price += $productCustomsPrice->custom_price;

before method return but this code not works correctly.
What to do?