Trunk release + factory remote?

Anyone know if it would be possible to wire up a trunk relase solenoid with factory remotes? My remotes have only 2 buttons lock and unlock.

Of course with relays, would there be any side effects to it if I used my 2nd unlock (Wire shows up as positive when unlock is pressed twice) wire?

Or does the solenoid need to have a certain delay of some sort?!

Any input would be greatly appreciated. Thanks

Any negative side effects from doing it the cheap way?

I have no idea what a pulse expander is but Im going to check eBay for one ;)

Just to make sure cause Im not too good with relays, can you double check if this would be right:

30 = Output to (+) side of solenoid

86 = Ground

85 = (+) 2nd unlock wire

87 = Fused (+) 12v