So consensus seems to be it's not worth it?
Yes it's worth it, I'm on a long trip out to Bernards loop stopping at quite a few locations. Am always careful but accident do happen, I purchased a B2 AFM and it repairs modules very quick, don't go with a cheap one, it can take ages just to repair 2%, even if you spend a few million you can sell it and get your cash back after your expedition.
One thing to note, if your FSD suffers damage it will start to develop fault's (Cutting out, refusing to charge) Trust me, it will drive you insane using a faulty FSD over long distances.
Things it cant repair -
Hull
Thrusters
Advanced Discovery scanner
And obviously it cant repair itself... My AFM is at 98% damage
since you are doing the same trip as me, I would definitely recommend these systems, they are enroute.
HYADUM - It has a ringed planet insanely close to a Supergiant
MINTAKA - Huge Blackhole
Spirograph nebula & NGC 1999 Nebula - Both beautiful single system Nebulae
Enjoy your trip dude!