Well, attached here is the one-page char-gen for my own homebrew, that I will be converting for BRP when I get time. (And others can do so for other systems, I guess). Quick and easy, and every player can have a copy - so no problem there. If that still isn't quick enough for you, the GM could always pre-gen a half-dozen characters and hand them out.
Keep adventures short, one-session affairs until you're confident the drop-out problem is past. The BRP QuickStart freebies (converted to your preferred genre) are ideal.
As for marketing, well I've made my suggestion before: something like the attached char-gen, plus a one-page (solo?) adventure on the back, printed by the hundred and posted through letter-boxes. Or for a more targetted audience, stuck amongst the D&D books on the shelves at your local Waterstones... BRQp1.pdf