I have been in the same situation as you, and did divorce....you are in a MUCH stronger position than you realise!
Were you to split, you would be due:
Half of his Pension
Child Support
Child benefit (always allocated to mother)
Economic recompense for taking the lower paid career, to care for children
Your portion of the equity
Generally, this would be apportioned to the period of the marriage though, so regards his Pension, you may only be entitled to what he has amassed in the 4 years that you have been married (or obviously longer, if you were to split up several years from now)
Regards the pension, he would not sign this over to you, you would sell the marital home, and take your portion on hard cash, from his equity.
Example:
Sell house for £400,000
Mortgage is £100,000
Left in cash £300,000
His pension worth £100,000
Yours worth Zero
So, of the £300,000 left, his parents take their 3rd of £100,000, you then have £200,000 left. You take £150,000 (Your £100,000 equity plus £50,000 for half of the pension), and he gets £50,000.
SHL would make this happen for you. It cannot be contested.