Trigger TIM channel when other channel detects rising edge

I have a properitary serial protocol where I have a clk line and a data line.

What would be the best solution to read data line when clk line has a rising edge using GTM?
Bit Compression Mode isnt the best fit since the waste of TIM channels.
TIM Input Event Mode on clk line which fires an interrupt on rising edge and reading data line in isr doesnt fit eighter since i want to keep cpu usage as low as possible.

What are my other options?

Thanks in advance.
Regards Julian