Stick with the LM2907
I'm sure the LM2907 is capable of doing what you want,
it just needs some component changes to set the range.
The IC has three basic sections, a trip amp, a charge pump and an op amp,
if the charge pump (and following integrator) can't be set to the desired time constant then the op amp can give lots of gain.
As you don't mention any component values other than imply you are following some datasheet,
Try C1 (from pin 2 to ground) as 2uF
and R1 (from pin 3 to ground) as 10k
or
C1 = 1uF
R1 = 20k
with everything else as per the datasheet (I'm looking at
https://www.electro-tech-online.com/custompdfs/2003/07/LM2907.pdf )
Should give 50Hz as 12v out with a 12v supply ... BUT
As the circuit will lose some voltage it will stop short of 12v out.
To do better requires more info - supply voltage, rest of circuit components ?