Looks like they do make a crimson trace laser for the P-32, I recommend you go that route rather then an ArmaLaser.
The ArmaLaser seems to be a reasonable good quality but the activation method is problematic. I can get mine to work "most of the time" I have a P11 that I bought used from a member here and it came with the ArmaLaser installed. When I hand the gun to my wife and tell her how to activate the laser she can not do it reliably.
I am going to start looking for a crimson trace laser for my P11 due to this because when the laser "comes on" my wife likes it but when she raises the gun to firing position it shifts her grip and the laser "goes out" and this is not cutting it.
If you do want regular sights why not try and find a good gunsmith to will take a set of metal sights the right width and silver solder them on for you. You could even get night sights this way, you would simply have to silver solder the sights on then insert the tritium tubes in to the sights and glue them so they don't fall out.
For even a half decent gunsmith this should not be that hard. Find metal sights you like, but with removable plastic inserts, sand the bottom to fit your gun, remove plastic inserts and solder to the slide. Test fire it to make sure it shoots straight.
After it shoots good enough for you bring it back to the gunsmith and have him finish blue it and insert some tritium inserts and your rockin it.
If your gunsmith does not know where to get tritium inserts, send me a PM and I can give you several sources for them.
To get the tritium night sights it is just a matter of making some tiny plastic tubes the right size, child's play for some one with a small lathe, then insert tritium vials, insert into sights, glue them in and you got the coolest P-32 around.