He should be delighted with that bridge, they are so well engineered, easy to use, once fitted and in my opinion, look great.
Re the pick ups, as with guitars the choice is huge and there are provably more good than bad. Might be easier to make a choice based on the style of music that your lad enjoys playing, or if likes the tone of a certain player, that could help.
IN my P basses, I love G&L MFD SB1's. I'm about to do a P bass build with Fender 62 reissues, as I've been so impressed when hearing them.
I would also happily use Entwistle pickups in guitar or bass, the quality is great, even though they are very cheap compared to many others on the market. I recently fitted a set of their humbuckers to a customer's Les Paul and he was totally delighted with them.
Anyway, hope he is happy with whatever you get for him.