I'd actually push back a little on assuming he needs more gear or beans right away. Before dropping money on stuff, have you asked what he's actually struggling with or what he's curious about? At that level of investment, his setup is probably solid, but the real gap might be knowledge or technique rather than equipment. I learned this the hard way with my dad - spent $60 on specialty beans for him and they just sat there because nobody told me he was already experimenting with three different roasters. Turns out what he actually wanted was to understand *why* certain brewing methods worked better for different bean origins.
What might actually stick is something experiential or educational. A cupping flight from a roaster he admires (something structured where he compares 4 - 5 single-origins side by side) forces him to taste differences and develop his palate in a specific way. Or if he's into the technical side, a decent scale accurate to 0.1g for dialing in ratios makes a real difference if he doesn't already have one - does he track water-to-coffee ratios precisely, or more by feel?
Before you commit, maybe casually ask what he wishes he had or what part of the process frustrates him? That beats guessing. If he's vague about it, a gift card to a specialty roaster he likes lets him grab whatever he's actually into that month without you gambling on beans or gear he doesn't want.