I'm afraid your only option is a system that mounts to the bottom of your frame or trigger guard.
Never seen any grip mounted sights, and
certainly a guide rod system is impossible. adjustable sights DO exist.
But one question, What are you intending to use it for? I used to have some laser sights on my toys but got rid of them. They have an intimidation factor and are fun in a smokey room, but I couldn't really respect a sharpshooter who uses a laser.
But more importantly, if this is for personal defense, and you are unfortunately involved in a fatal shooting,
a prosecutor might come after you,
1. as a "killer" or looking for a gunfight, or...
2. If you had a laser sight, you could have easily targeted a knee or etc. and strategically not caused death.
Its better two be judged by 12, than carried blah blah blah, I know... but I practice to avoid either of them.
If you've got two P7M13's, you don't need lasers. NICE GUNS