For now, adjustment values would suffice; the Printkit is a good place to start.
Which is exactly what you’ve already said yourself.
Unfortunately, there’s a high failure rate and several attempts are necessary.
If you want to produce colour negatives and RA-4 quickly and conveniently yourself, it unfortunately costs a lot of money.
In the past, many amateurs have only managed one attempt with the colours. It’s a technical matter and a certain degree of standardisation is necessary.
Good temperature control is also essential.
We can only recommend trays for a few experiments.
After that, you’ll quickly move on to drum development, and if rinsing and drying become a problem and a hassle, you’ll end up using a continuous processor.
Don’t forget, either, that the light you can use in a colour lab is much less than with B&W.
Best regards,
Robert