Midi Transformer - Control one CC with two CCs in a complementary way


Is it possible to control a CC with two CCs in a way, that their values complement each other?

To be more specific: I want to gain control over CC1 while using a mix of CC74 and Aftertouch. Each of my two controllers of choice are set to 50% right now, so that in theory I would only reach 100% of CC1 when both CC74 and Aftertouch are on max.

Unfortunately right now, the data of CC74 and Aftertouch are overwriting them selves, leading to unwanted jumps in the target CC1…

I am happy for any advices.