I’ve created a small demo plugin which does what you want.
You can get it here https://github.com/Arsenal21/stripe-payments-enhancements/releases/download/0.0.9/asp-minimum-amount.zip
Install on your site and activate it.
You can adjust it for your needs by editing the code (it has instructions provided): https://github.com/Arsenal21/stripe-payments-enhancements/blob/0.0.9/asp-minimum-amount/asp-minimum-amount.php