First thing I pick out from your questions - it is not standard procedure to "cut out" a physical blockage. Cutting rabbit intestines carries a very poor prognosis so the usual method is to "milk" the blockage along the gut until it's in a place where it can move along safely on its own/with the help of medication.
A lot of the answers re risky will depend on the reason for the gas. A tube into the stomach to help the gas move upwards is less invasive than abdominal surgery but the prognosis will depend on the cause. Sometimes, when they do abdominal surgery they will insert a tube to ease the pressure of the gas in any case, so it could be both.
It is very scary but even if it does come to surgery, in experienced hands there is still a lot of chance of a good outcome. I have had something like 80% survival rate.
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