Merging noteheads

[Jeremy]

Hello,

Is there a way to merge noteheads of the same color (but not the same
value), in this sort of context:

   <
     { r16 [e fis b] } \\
     { s16 e4. }
   >

"e16" and "e4." have both the same noteheads, and I'd like to merge
them without having to remove noteheads individually.

This is a practice I've seen many times in engraved editions.

 Jeremy