Not an easy option as all the speakers were fed individually from the amp under the seat, which means 3 pairs of cables through each front door, where as you have 1 pair of cables into your doors then a cross over for 10 speakers or a capacitor in series with the tweeter for the 8 speakers.
lots of extra wiring for no reason, your better off just buying a normal amp and wiring that in, far less to do.