terrible situation to be in flowertot and you have my sympathy.
Lizs is right to suggest mediation, that may be very helpful to you as it may avoid court however from what you've said, if he won't voluntarily supply his financial disclosure, chances are he won't agree to go to mediation.
Yes, you could agree to settle for a 50/50 even though you would be entitled to more in order to avoid court costs. However, to make the agreement legally binding (very important if he is potentially going to go bankrupt) you need the agreement to be incorporated into a Consent Order to be lodged at the Court once Decree Nisi has been pronounced. Unless you do this, any agreement will not be legally binding and he (or you) could potentially seek more at a later date. However, the District Judge at the Court will only ratify (approve) the Consent order if he/she feels it is fair and reasonable. If the DJ feels it is not reasonable (ie you are not getting enough of the equity) then they could refuse to ratify (approve) the order.
You would also need to have had full financial disclosure before the terms of the Consent Order were agreed.
If you DH will not provide full financial disclosure off all his assets (and debts) then you will have no option but to issue an application for Ancillary Relief (financial support) in the County Court where the divorce has been dealt with. This will trigger a series of up to three Court appointments and a great deal of paperwork will need to be collated, filed at Court and exchanged with the other side prior to these hearings. This will get very expensive, particularly if the matter goes to a final hearing. It is likely that you could get more than 50%, even as much as 70% but it could be 70% of a lot less taking into account all the costs!
You really need to try to resolve things sooner rather than later to try to get an agreement/Court order before your DH's bankruptcy.
If you feel your solicitor is not acting in your best interests you should consider looking for a new one. I'd recommend you look for a member of Resolution in the hope that matters could be resolved as amicably as possible (google resolution solicitors, sorry, haven't time to find website, baby is crying) good luck