If I wanted to arrive there I would probably go with:
- CTV + CSFS + IKEY [+ PC]
- TXHASH + CCV [+ CAT]
- GSR + ECops
TXHASH and CCV together make it extremely unlikely that CAT would be used for wonky inefficient introspection.
If you have PC you can delay CAT, but you need multi-commitments and Merkle stuff eventually. Alternatively you can go for CAT in step 2.
STARKs become a possibility at step 2 with CAT and afaik pretty much a certainty at step 3.