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DSP looks like it will work and can provide the lpf and HPF for front door and underseat woofers. So try a HPF of 120hz LPF on the doors. And a LPF of 120hz and HPF of 30 hz on a the underseat woofers. Used 24db for slope and use Linkwitz–Riley crossover filters. They have a good suming between underseat woofer and door mid bass. For door tweeter to mid bass make sure there is a factory capacitor on the tweeter otherwise easy to blow.
With Bills crossover component list you could source alternatives in South Africa of via aliexpress. Parts Express are no longer viable internationally as they have high freight costs post Covid-19.
Get the 4 channel Loc as that would give you an option to run a second four channel amp for read doors and a trunk sub later on.
Amp wise it will run the HK woofers , it just won’t make as much power due to 8 ohm load. I’m guessing based on large heat sinks and 30 Amp fuse rating is probably class A/B with around 60 watts x 4 so you’ll get half that rating into the Harman Kardon woofers. The Harmans are reasonably efficient, just balance the output of to the front door and woofers via gain control on dsp.
For time alignment in dsp have a look at the table in my base audio build a few pages in and use the mid door bass and underseat right hand drive values.
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