will of spousal relative

TBagpuss

It's the making of a financial order, not the making of the divorce, which is relevant to how either of you can make financial claims again the other, so the divorce going through wouldn't stop you making a financial claim.

So, have the divorce go through, then decide how to proceed.

Other than any inheritance he might have, are there any financial assets such as a house, pensions or savings?

Normally, you wouldn't be entitled to a share of any inheritance he might have, particularly if he didn't become entitled to it until after the marriage was over, but if he has had an inheritance, it would potentially make a difference to how the other assets, which might mean that you would be entitled to a larger share of any joint assets than you'd otherwise have.

If your husband is now willing to pay for the divorce, use the money you save to see a solicitor - take with you a summary of what you know about what assets you and your ex each have.