Ti fork is a niche, if you want it, then there's no stopping you, but it's a pretty expensive and won't be as good as a custom steel fork (I'd go for that to gain a lower trail for the porteur rack).
Would depend on how light/expensive the steel ones were.
If you're going custom you can put eyelets wherever you want.
If that's the case, go Dynamo front hub and get the cable routed internally.
Ti forks are too flexy so I've been told...