I think power scaling has to be HT voltage reduction, so my guess is it'll have to be cathode bias??? Be interesting to find out!
On Webervst.com message boards there's a attenuator design, they work really well and the bits cost a few £££ plus a box. They reduce the volume by a fixed amount, and sound more natural than you'd expect. The ones I built hold up pretty well against my Hotplates.
As for picks.....they wear away! Choose them on tone and feel and get used to throwing them away when they're done. You can file the BKP picks back a bit.
celluloid sound great, I used to have half an old tortoise shell pick, it sounded great but alas no more. Celluloid tone is better than plastic, and D'Andrea are better than Dunlop IMHO...
Just remember, listen to the TONE and pick the one you like!