We can offer a so-called sponsored development for those kinds of projects.
Basically, you have a request. Our team estimates the effort. We give you a fixed price offer. You order and pay. We create the feature. You get a 3-year-license on top. That's the basic deal.
And naturally, we'll maintain the feature in future releases. 80% of our development works like this. It's an easy filter. We only build stuff that customers want and pay for. Those customers get rewarded by licenses. The product is improved.
Please read more in this link: https://info.seibert-media.net/display/we/Sponsored+development