If Jan wants to, it is certainly within his power to cover some of the cues that didn't make the "ultimate collection" and release them via digital format only. He just needs positive, savvy people surrounding him that will believe in it and promote it, for free (on places like Facebook, twitter, soundcloud and tumblr). There's a whole new generation of people out there who are currently making synth driven music under the genre "new retro wave" and "synthwave" etc. If they know the original master (Jan) was coming out with more stuff, they'd buy, because they buy new retro wave artists with a fraction of Jan's fame and output. If there's a will, there's a way.