K8057 reprogramming

The K8057 and K8059 combination seems to fullfill my needs. But, not as they are, my demands are much simpler. I have no experience with PIC’s, but it seems to me that with some small adaptations i can use these units.
What I need are two channels which act like this:
Push A and channel 1 switches on, channel 2 automatically switched off. Push A again and channel 1 goes off, channel 2 stays off.
Push B and channel 2 switches on, channel 1 automatically switched off. Push B again and channel 2 goes off, channel 1 stays off.
So there are 3 possibilities: 1 and 2 off; 1 on and 2 off; 2 on and 1 off.
1 and 2 on at the same time not allowed.
Also just as would go with a simple 3 step switch: 1 - 0 - 2.

My more experienced friends say i need the codes for the 12F629 in order to quick rewrite the program.

As long as I’m not sure this can be done, it is not usefull to buy the units.

Sorry, these projects are not open source projects, so we’re afraid we cannot supply the source code.
Also, we do not have the means to supply modifications on demand, unless substantial quantities are ordered (1000+).