Drums : align triplets to eights in other voice

[Wim Van Dijck]

Hi all,

Version : 2.12.3 on OSX via MacPorts

Given

\version "2.12.3"

swing = \drummode { cymr4 cymr8 cymr8 cymr4 cymr8 cymr8 }
down = \drummode { \times 2/3 { bd8 sn sn } \times 2/3 { << bd hhp >> sn 
sn } \times 2/3 { bd sn sn } \times 2/3 { << bd hhp >> sn sn } }

\score {
    \new DrumStaff {
<<
        \new DrumVoice { \voiceOne << \swing \down >> }
> >
    }
}

This is an exercise for a jazz swing rhythm. I'd like the third note of 
the tuplets in "down" to lign up with the second 8th notes of the 
'swing'. Is this feasible? I joined the two voices, because I want the 
stems to be aligned as well.

I've been perusing the archives and have not come across a previous 
request like this.

Kindest regards,
Wim