The KN5000 had a style converter disk supplied which will convert KN750 composers so you don't actually need EMC for this particular job.

Sequences: the easiest method would be to re-save the songs in a KN1000 if you can find someone who still has one and will do it for you. The next step would be to resave the 1000 format in a KN2000. That should be fine into a 5000. I resaved songs from 800 to 1000 to 2000 to 3000 to 5000 etc etc and they came out ok with minor tweaking. That would be far simpler than midi recording and remapping the drums even if program change data and drums sounds could actually be output in the first place which could be a hurdle.