Dont have an goggle answer for you and will share my experience. I to have quite severe astigmatism that the correction cant be built into a swim goggle. After much searching and enquiring I went for contact lens. I only used them for swimming and never had any trouble with infection or anything else. Aside from the learning curve to insert and remove them, but like everything I learn after some practice it was not an issue. They allowed me to see a rather small waterproof watch in quite dark conditions. My suggestion is give the contacts a try. Mine ran about $200.00 for a set of 6 pairs that I replaced every 60 days. Usually they are replaced every 30 days but as I swim every second day I could double the life expectancy of each pair. After about 6 months I had to stop using them as I had a Glaucoma operation that would not allow the use of contacts. No the contacts didnt cause the glaucoma. :o) I have had that for about 15 years.
May we swim with ease at the speeds we choose.