not sure there are any good hybrid razers that could do beard and hair - blade wouldn't last long, panasonic has comb widget you can mount on top of existing head which would do it (bar the blade life)
blade cost - braun 9 blades are similar price to pansaonic - braun 7 isn't a 'linear' motor like the panasonic ,
if you like the shaver worth buying a few blades in advance if you see offers, my older 3 blade panasonic only being retired because blades are in short supply and £50, more than a replacement new generation 21.
older ones didn't have this stupid AI speed control, where you usually have to wait for it to respond when you shave a tougher bit, or, if it were going faster for neck, you could make one pass if it decided to go fast -
enough comments about that on the excellent shavercheck blog and comments there;
also when it changes speed it slows temporarily so can get some ripped hairs.