Sperzels really are quite easy to fit - unless you already have another brand of non-locking tuners and you want direct, no-modification replacements, I wouldn't worry too much about the installation.
I've had lots of different locking tuners. My personal favourites are Gotoh Magnum Locks - the locking mechanisms are in the tuner posts so they look almost exactly like stock tuners. And you can get them in both vintage and modern styles.
Apart from those, you've got Grovers - work fine but they're heavy and the posts are too long IMO (on the 3x3 set, at least); Planet Waves - again work very well, but the posts and thumbwheels are finished in black, which looks weird on more vintage-styled guitars; and Schallers, which again work great but they're heavy - and also getting much harder to find. Oh, and TonePros/Kluson - I haven't tried them but they have screw-down locks on the tops of the posts, like PRS tuners.
If you long for Sperzels, I'd get Sperzels.