Yes, you could hire someone to do the design work. An off the shelf active crossover is going to be only part of what is needed, however. If there is any "voicing" done for the individual drivers within your speakers (there very likely is), this frequency response / phase compensation would have to be incorporated in addition to the basic need to split the signal for bi-amplification.

In my system, I use a Linkwitz-Riley 4th order electronic crossover configuration at 500Hz that I designed and constructed myself. In addition, the high frequency driver needed a low-Q notch filter at 1.6Khz to pull down a very broad plateau of about 6db in it's frequency response. The crossover also handles the 60Hz subwoofer crossover for my stereo subwoofers. This is an example of what would need to be done.

One of the reasons for bi-ampling is so that you can select the best power amplifier for the frequency band of each driver. For instance, you might select a good, modest powered tube amplifier for the high frequencies where the smooth character of a tube amp would make the biggest impact. You could use a good, stiff solid state amplifier for the woofer, where the high damping factor of solid state would be of good use in controlling the driver.

Using identical amplifiers for both frequency ranges (as you indicate you would do) is not a terribly good idea and throws away a very large benefit of going the active crossover route.

As you can see, to do it right, you will need to expend some serious money. You really need to ask yourself before you jump into this whether simply upgrading your speakers to better ones would be more cost-effective. If you do decide to hire someone to do this, just make very sure that you are getting someone qualified to do this very specialized work. Some "home theater installer" guy down the street is almost certainly not going to be able to do the job correctly. You would need a real professional designer who knows about electronics, speakers and acoustics and has done this sort of thing before - preferrably many times before!