Thoughts on a continuous 4:1 fasting cycle for ~4 months? (159kg / 180cm M)

Hey everyone,
I'm a 180cm male currently weighing 159kg. I have a major occasion coming up on October 19th, and I really need to drop a significant amount of weight so I can look presentable by then.
My plan is to run a continuous cycle: 4 days of water fasting followed by 1 refeed day. I'll be doing this strictly under the supervision of my doctor, and I'd be running this cycle back-to-back from now until the event (about 128 days).
Has anyone here run a 4:1 cycle for this long? Is it realistically manageable, or does the cumulative fatigue/hunger catch up to you? Would love to hear your experiences or any advice on sustaining this. Thanks!