Does anyone have experience of trying to get travel insurance within three months of surgery?

I'm tentatively having abdominal surgery (probably laproscopic) in May.  I'm booked to travel to Hawaii for a couple of weeks in mid September.  Generally travel insurers require you to notify them about any surgery within the previous 12 months.

USA is a WCS for travel insurance at the best of times, due to medical costs. 

I'm wondering what the chances of my getting insurance or having policy exclusions imposed if I can get it.

Also keen to hear if anyone has funded an insurer that has a more lenient policy.