Being able to reach pump once fully rounded

Hello everyone- first time here. In the last week I have rediscovered my fascination with "blowing up." I didn't realize when I was just a kid that the strange feeling I had watch Violet Beauregarde inflate to a blueberry was arosal. I realized that I feel that same heat every time I see any sort of abdominal swelling especially if it progress to a full sphere body shape. I had messed around with stuffing when in high school- packing down my belly and butt in my stretchy stirrup pants all the way down to make cankles. Then I would hobble around my bedroom trying to walk and bend over which was near impossible while smacking the orb of a belly I made with all of my pillows. Just this week I realized that I can put a trash bag down my leggings and blow myself up. I'm using just a regular kitchen size trash bag (lavender scent) with a large thick plastic drinking straw that I've sealed in with thick packing tape. It is amazing! I love the growing pressure I feel pressing down on my belly and crotch. I did manage to rip the crotch out of one pair of leggings. I think it's only a 13 gallon bag. I haven't gotten a pair of pants that can hold more just yet as I'm 140lbs myself. Not much wiggle room when my goal is to appear 500lbs. So I've ordered a few plus size body suits and I have ordered a custom zentai suit so I can turn myself into a sphere. I plan on assembling four 50 gallon trash bags to inflate. Since I have never attempted anything on this scale I'm slightly worried that once the air pump has gotten me at max capacity that my arms will become immobilized and will not be able to reach the pump. Which leads me to my next worry. I will be alone doing this since I want to experiment more before telling my husband as I am not sure how he will react as he is 300lbs plus. I like real tummies more than balloon one. So I can't let him discover me stuck as a giant blueberry, trapped because I couldn't reach the air pump or reach my neck where I intend on installing plug. Any knowledge as to how much movement I will have using mega thick trash bags under a zentai suit or any advice on pump placement would be "fully" appreciated.