I'm actually still using the steel studs, but I use plenty of copperslip on them and fit deep SS dome nuts to cover them completely.
The studs I suggested were copper plated with copper plated or copper nuts, but Ti would be pushing the boat out, so long as you also use Ti nuts on them and some copperslip or moly grease to stop galling.
I'm not a fan of SS studs myself, but I'm sure plenty use them. It could open some discussion on different folks favourite..
Moto Rapido should be able to provide you with the correct key blank. I've always found the key cutter at the Dixon centre in Hellesdon to be very good, I haven't beaten him yet, but I know nothing about programming chips! Sorry.
Dixons Shopping Centre. 159 Reepham Rd, Norwich, NR6 5PA