Hide text in banktransfer plugin

-- HikaShop version -- : 5.1.0

In Joomla 3 we had a fix/override for /plugins/hikashoppayment/banktransfer/banktransfer_end.php to hide a part of the text. It worked even after installing updates.
In Joomla 4 this solution doesn't work anymore and it looks like a core hack is the only way to get the same situation. We want to stay far away from core hacks because of the risk with updates. Is something possible without using a core hack?

Hello Philip,
Because of the holidays I wasn't able to respond soonder.
How it works: the following lines are commented out to prevent adding text:

JText::sprintf('PLEASE_TRANSFERT_MONEY',$this->amount).'<br/>'.
$this->information.'<br/>'.
JText::sprintf('INCLUDE_ORDER_NUMBER_TO_TRANSFER',$this->order_number).'<br/>'.
JText::_('THANK_YOU_FOR_PURCHASE');

Saving empty language values could be an option but it displays the variabes $this->amount, $this->information en $this->order_number
Hiding with css isn't an option too, because it's in the same container as ORDER_IS_COMPLETE

An override seems the only way, but doesn't work. Though www.hikashop.com/forum/payment-methods/9...fer-end-message.html mentions it should work.
I've tried it with the file in templates/base/hikashoppayment/banktransfer_end.php and templates/base/html/hikashoppayment/banktransfer_end.php
In both cases the override doesn't work