But what left me really wondering this time was following. I tried to comment out "U0xfb35" table in "char-def.lua" for proof that this solution should work at all. However, for my surprise, it had no effect at all. For just in case, I even purged my Ubuntu PPA packaged version of ConTeXt to make sure that this modification I made to standalone version is really used. No effect. I also checked that my TeX file should have the correct characters, not the already combined ones. No error in there either.
After changing one of ConTeXt's source files, you should remake the formats with context --make cont-en (or context --make, if you want to make the dutch/german/etc. interfaces, too.) Can you try that, and let us know if it works? Kind regards, Sietse