Splash weapon as improvised melee weapon?

[Katydid]

If the splash weapon itself does no damage, could you break it in melee on a willing target and splash everything adjacent to said target?

I was hoping to make it look like I was attacking an ally to the enemies (they're not hostile to me) without actually doing damage, and racials prevent either of us from being affected by the splash itself.

Thanks!

[Diminuendo]

I'd allow it with the non-proficentcy penalty, but I would also splash the user.

[Eridan]

You can throw a splash weapon on adjected enemies but that would prokove an AoO.

Use a splash weapon as improvised melee weapon sound ok as long as you live with 3 negative effects.
- a -4 modifier to attack rolls if you are not proficient with improvised weapons
- feats / abilities for splash weapons dont apply
- you are in the splash area and get damage

No real RAW support for this question but solved RAWest as possible :)