You can not play JP OoT on a PAL N64 as the PAL N64 won't be able to play the Japanese NTSC cartridge due to the console being the wrong version. If you want to play JP OoT you will have to acquire a NTSC N64 and possibly replace the back of the OoT cartridge depending on if it's region locked or not.

I'm wondering why you would wanna speedrun OoT with a texture pack in the first place?

could you guys change my name to "Mr_ZG" ofc without the quotations ;) that's what I go by these days