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The real reason you need high C-rate cells for a car is so the alternator doesn't wreck the battery when charging. In warm weather at least, you can get away with a pretty puny battery for starting a car, and the battery won't be damaged from high current for 1 second.
If you want to use LFP, you need to do two of these three:
1. Keep it topped up
2. Avoid cold weather
3. Don't be tempted by "3x Pb equivalent", get a bigger pack (I would suggest 20Ah at the very minimum)
A proper BMS for this purpose is actually quite expensive since it needs to be capable of switching several hundred amps. If you avoid letting the battery drain, you can get away with only cell balancing. Otherwise, you need low temperature and low voltage cutoff with a very large MOSFET bank, and it's not cheap.
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