You can't. MorphOS key works only on machine it was generated for. Also, 1.4.5 can't be registered anymore.

603 is just too slow for UAE. It can be integrated separately. When I had a 750CXe 600MHz it could run most 68000 OCS games, but even then some were too slow.

MorphOS has integrated 68k emulation with JIT, as long as the 68k software don't t hit hw directly - it works. For games you usually need UAE. EaglePlayer works if AHI is used as the audio output.