For those still wanting to try Dudley fixes (and tweaks, which is the single close to a Spell Revisions mod for vanilla BG1), I think I found the fix for Ulgoth Beard not being accessible if you follow the instructions provided on dudley page.
If you look here
he says: "I have reinstated the option to travel to Ulgoth's Beard from behond Tenya's hut which was erroneously removed in an earlier fix."
The problem is that the FixPacks 1 from this page
does not contain the latest version of fixes. If you download the separate Areas Fixpacks from the same page you will note that the file for AR0900 is newer than in the complete FixPack. So after extracting the fixpack you should download all the separate fixpacks (which are the latest versions of fixes) and overwrite those from the fixpack.