What is forebearance in relation to mortgages?
Your two investment properties are making a profit, and you are well able to manage the repayments on these from the rent, can you also lob in the profit every month to reduce the capital amount to get the negative equity down if it it troubling you and also in case you have to come of IO (interest only) it might be a good idea as then they will be more affordable.
In relation to your home, you have 200K in cash and a really good income. How about you put 150 K into the mortgage, keeping 50K, that would give you a mortgage of 750K so a negative equity of 100K and then with your very large income you could overpay the mortgage.
You say on this you are only paying 1K a month, what would this be if capital and interest. Very surprising that on your income you are only paying 12K in mortgage repayments. How much are you saving annually?
Certainly I'd be concentrating on getting rid of the negative equity and overpaying so that should the day come and you have to pay capital and interest that it will be possible to do so comfortably on your income and also have the possibility of being able to sell if need be. Nothing worse then being forced by a bank into a corner.