Wiring head unit with amp later

[Linux_Box]

tldr: what is the best way to connect HU harness (pioneer) to speaker harness (scosche TA02b for Camry)?

For money reasons, I'm going to purchase a new HU to replace my stock HU and buy my amp in a couple of months. What's the best way to connect new HU with wiring harness for my stock speaker wiring? I'm thinking wiring nuts (twist connectors)? I need flexibility so I can put the dash speakers on the HU and door/rear deck speakers on the amp once installed.

Do people solder them or use other method to connect them?

Any help is appreciated!!

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