I believe your transistor bases will need current limiting resistors.
Strictly speaking, I don't believe R25 is required.
Given the same current requirements for the same brightness, Red will be brighter because the green has two voltage drops to ground, opposed to one for the red (one transistor above, two below). You could install Q88 (new) above Q8 and always on to equal the voltage drops.
I'm also thinking you could exchange the XOR gate for another properly wired transistor to control Q9.
Off the cuff, I'm thinking Q99 (new) could be connected Collector to R22, Emitter to ground, and base to alarm, to control Q9. When alarm is on Q8 will be on and Q99. Q99 on will pull Q9 base to ground, turning off Q9. I think. Can someone double check my logic?