Blumin heck OP. I don’t think I’ve seen anyone on MN as much in need of a SHL as you. You really are the most in need.
I’ve name changed, so I can tell you some figures and you can weigh it against your own. I’m a step mum btw, and so that should usually put me in the pro-father camp!
At the time of separation, my OH had 3xDCs aged 4,6,7. My OH was earning £60k and ExW was earning £30k and rising (having recently returned to work)
She kept the family home and they liquidated joint investments so he had some cash - it worked out he had around 30% of their “equity”.
He has the DCs EOWeekend and a night or two in the week. He pays £200pcm in spousal maintenance and around £600pcm in CM, all agreed out of court, but solicitor advised. He loves the DC v v much, but as you’ve described, it will always be their DM they want first if they’re ill, a bad dream, want to tell a success and it was right to weight it that way.
It did cost circa £10k in Sols fees.