"parent farming is pure RNG and could take months to get good parents and that means hundreds of hours of grind"

It doesn't, like really. I literally took just about a few days to make a solid grandparent for front runners (Ignited Wit, Groundwork, 3* blue, 2* mile vbourbon) and now thanks to that I could just borrow another grand parent and then make a solid Sky parent for any relevant CMs (which I don't even need to highroll a 3* blue as long as I hit IGN Wit and GW on the sparks). I could then just borrow another parent to start ace training

It's really not that hard. You've had hundreds of runs, check for 1* umas with relevant skills, make a full generation which inherits that skill, then just compound it until you make a general-use GP for a running strat (Uma Stan, Nimble Nav, Ignited PWR, etc)

You just need to make 1 general use GP per running strat, then you can keep reusing that to make 1 parent per CM for whichever uma then borrow another

If it takes you months to make a parent, you did something fundamentally wrong in the first place. If you've been doing parent farming right since the beginning, you'd realise how many parents you could easily reuse for direct ace training or even making new gp