0. Well, first you should ask if your model is hackable. Which PS3 model do you have?
Originally Posted by SmrtMouth
1. Not really, connecting to PSN on CFW is always risky.
2. PSN Tool is said to prevent bans by hiding and spoofing different things related to CFW. Now how effective is it and how long is it going to stay effective, I don't know.
3. You can sync your trophies, but safely, no. There's always a risk. Updating to OFW just to sync and then downgrading again is going to be a hassle. Keep in mind that updating to OFW is not enough, you would also need to format your HDD to remove all CFW traces (GAMES, pkgs, etc...). I'm not sure if you can data transfer your trophies from one PS3 to another.
CECHL 500GB: OFW 2.50 > OFW 2.76 > OFW 3.41 w/ dongle > OFW 3.55 > 3.55 kmeaw > Rebug 4.30.1 > Rebug 4.30.2
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Off to my summer vacation, might be AFK for a while... Happy Summer!