I think knocking down the bell amount to 20,000 bells was a good step. It allows new players to make that first payment without having to resort to selling fossils instead of donating them to the museum, but it makes new players get it done themselves afterward. I still wouldn't give them the hybrids directly. Maybe give them some regular flowers with a watering can so they can breed hybrids themselves. I would give them an entire tool set (shovel, fishing rod, bug net, slingshot, megaphone, maybe an axe) because waiting for them to show up at Nook's isn't really "rewarding" for new players as much as it is just annoying and unnecessary. I don't want to dictate how you do this, but I'm just telling you what I would do and the reasoning behind it based on my experience as a new ACNL player.