tidy piano glissandi

[emily atkins]

I'm looking for the ability to span treble and bass clefs 
with a glissando, similar to what can be done 
with arpeggiated notes. 
Right now I can't get the two clefs 
(glissando start and stop voices) to interact for this specific case.  
The bass clef gets shoved down to make way for 
multiple ledger lines dropped from the treble.  
I've searched previous threads without finding ideas on 
how to simply inform the bass clef voice of its 
interaction with the treble clef voice.
What to do next?