I may be a bit thick here, but I have an unused MC200U here still in original packaging with manual (It was given to me on a visit 20 plus years ago, didn't have the heart to say I was already using an MC30 ) and it definitely states that the stylus is non replaceable.
From what I can see, the "stylus" you are referring to is actually the complete "motor unit" with stylus. This would make manufacturing sense so that it would then just slide into the different body holders.
Would I be correct in this assumption? If you think it is that good I shall have to give it a try.
I also have an Ortofon Quasar and a Quattro but little is ever spoken of these models, which must have been a bit of a failed line for them.
A Canadian enjoying Wales.