Nah, multipliers are locked on mobiles, but its not really an issue. It's much better to simply lower the multiplier and just boast up the HTT speed for the best results.
Venice cores will probably overclock just as well if not better than mobiles, and they many more vast improvements so I think that's the better choice.
AMD seems to have a very good variety of overclockable cores, the mobiles aren't just in a class on their own anymore.
Intel C2D E6320 / AMD Athlon X2 3800+
Gigabyte 965P DS3 / DFI nF4 Ultra-D
2GB OCZ Gold PC2-6400 / 2GB OCZ Gold PC4000
eVGA 8800GTS 320MB / eVGA 6800GS 256MB
150GB Raptor / 74GB Raptor
2x500GB / 320GB
OCZ GameXStreme 850w / OCZ StealthXStream 600w