Maybe take a look at this from Brand X. I know it's overkill, but I believe it will do exactly what we are looking for, contant/stable power!!!
External Regulator Model BXEXT1 Agm / LFP / LTO / NMC compatible
Up to 4 alternators capable, jumpers built in for user switchable voltages for different battery chemistries. End user repairable / modular for adding up to 4 alternators as your system grows. capable of running up to 4 600+ amp alternators in a heavy duty environment with 15a of field output...
brand-x-electrical.myshopify.com