If you have already bought the extension, then its installation is a free service for you. Just provide me an SSH access to your store's server. You can use my public SSH key for it.
It is possible: the price depends on a extension and starts from $5.000.
You will get 2 years of support, updates, and free installation service for all your clients.
Screenshots
1. The frontend checkout screen
2. The frontend «checkout success» screen for a bank transfer payment
3. The «Order Information» → «Payment Method» block on the frontend order page for a bank transfer payment
4. The «Order Information» → «Payment Method» block on the frontend order page for an iDEAL payment
5. The «Payment Method» block on the backend order page for an iDEAL payment