Edit: I think I may have figured it out why belloq didn't talk...it may have something to do with the conditional. I used a == for the journal quest in the script when I probably should have used =>...see the spoiler for quick solution
Ok...not sure what happened with Belloq, have never had or heard of a problem before...basically, you take the keys to belloq and he translates them and combines them into one master key to allow entrance to the tomb...I guess you could use the cheat code...giveitem key_thulsa, just make sure you are in the valley module where belloq is to get it
You need to do more at the shuttle module...did you deactivate the force fields, fight the guards...go thru the door towards the sactuary.
did you also notice the patch in this thread regarding HOTOR? If not you will need it.