Any time you change string sizes you should consider having your guitar setup as well..
You COULD just slap a set of different gauge strings on your guitar but you will almost always have tuning issues after doing that. The guitar's intonation will need adjusted as you go from gauge to gauge.
Don't mess with the nut. Changing string sizes isn't really as simple as just deciding to change from 9s to 10s and bada bing they're on and you're done.. That is, if you want your guitar to be in tune and be setup properly according to your gauge.
You might just need a neck adjustment too.. You drive a car for a while and you knock the wheels out of alignment. If you put brand new tires on your car....... you're still out of alignment....
My advice is, decide what string size you want to play.. 9s or 10s.....
Find a good guitar guy and tell him, you want your guitar setup, and you want it setup with (insert your desired gauge).
Get your bridge/intonation set and make sure the neck gets adjusted so there's no fret buzz.....
BANISH THE IDEA OF USING CRAZY GLUE FROM YOUR THOUGHTS IMMEDIATELY......
You screw up just a little bit, just one time and you'll regret mixing guitars and crazy glue....
Get someone to set your guitar up correctly and then stick with the gauge you choose for a while.
It really makes a great difference if it's set up right.
Just my opinion... It's your guitar....
Hope that helps a little.