I think you need to untangle how much of this is about keeping him up with peers incase of going to school and how much is a wobble.
The beauty of home education is that you can account for your child's individual development. Wobbles are normal, we all get them no matter how long we've been doing this. Learning to trust your child's own developmental timeframe (which does not mean not supporting or encouraging!) is one of the big hurdles you need to jump to home educate.
In a way, whether you intend to send him to school at some point or not is irrelevant. You cannot make a child learn to read or write if they are not developmentally ready and pushing your son into academic learning too early will only do 2 things: make him resent you & home education and make him hate reading/writing.
So, what to do? Well I would initially look at what activities you are trying to get him to do that he doesn't want to. Learning to read is a journey that should be pretty enjoyable for your child. the best way to get your child to read is to read to them......lots, whenever they ask (within reason) & get to know what books they enjoy.
If you really insist on phonics, fine but make it enjoyable. By that I mean find how your son likes to learn and what his interests are and build that into the activities. For example if I made my son sit at the table with a phonics workbook he would rebel, but he will happily sit outside with me and fill our patio with chalk drawings of 'th' words.
My daughter learnt to read just before she turned 8, but she went from zero to hero overnight. I could not tear a book away from her now if I tried, she is a fanatical reader and her writing is catching up fast.
My son is still on the road to reading at nearly 9, but he is not far off. He's on the cusp, and the best thing is he loves books.
I think jobs aside, you need to reflect on how committed you are to home ed in the long term. Are there others ways you can 'work' and home ed if need be? It will challenge your idea of learning, how children learn and when. You will have wobbles, a lot, but it is a truly amazing journey and that will gift you with the thrill of seeing your child reach his potential and grow to be the person he needs and was born to be.
Very structured learning can work well for some families, in fact my daughter enjoys structure now she 10, but would have previously turned her back to me (literally) if I tried to teach her anything before now. Formal learning when its enforced can really backfire, and I have seen it happen a lot.
Good Luck:)