Hi @joost_Cuppes, welcome to the community forum! Please keep it in English, only here you can ask your questions in Dutch.
With Homey you can only use devices that are supported with an app. So when your device is not listed in the app, you can not use it with Homey at the moment. You can request the owner of the app to add your device. In this case the owner is Athom (maker of Homey), so you can request a new device here: https://go.athom.com/request-device-support
Requesting a new device is certainly not a guarantee it wil be added, it depends on the number of requests. You mentioned your device is an older version, so the question how many other people own such an older device and would like this feature too?
In the meantime I strongly recommend to only buy devices that are already listed for use with Homey. At least that’s my strategy: when I need a certain type of device (say a light bulb), I first check all the apps and devices that are supported. Then with this shortlist I start looking online for a buy comparison.
It will save you from disappointments