Toby, we use our Avios for hotels, so the money saved on lodging can supplement the business class budget. So perhaps if you did this, your total trip costs would be more acceptable to you?
With some research, using Google Flights, I think you can come in under $4000.00 each. Actually, that's the highest we have ever paid , from the West Coast. And, there could be sales sometime before May. We, historically, have paid between $2200 to $4000. Each RT.)
You may want to check out getting a new airline credit card, and explore the bonus rewards and discounts. For us, our British Airways visa gives us 10% off flight purchases, and we combine that with the AARP discount, which recently came out to $600 off each business class ticket.
If you have the luxury, treat yourself. It's great having the flights being part of the vacation, and not dreading the travel, being less of a zombie upon landing, less prone to making a mistake, or losing something. As mentioned earlier, the lounge access is a treat, and I agree, when the flights have been canceled, we were treated very well by the airline staff. I'd much rather kill time during a flight delay in a lounge.
Also, we never pay for seats, just grab them when seats are free to book- all the business class seats on the new configurations are great. Do check out your plane model and know the difference between old and new configurations.
One problem if you do it- it's almost impossible to go back!
Let us know what you end up doing- good luck!