OP I'm pretty shocked at people acting like having another child is irresponsible/ up for debate. Its entirely your choice. I don't think its radical to be prepared to go through this for a second child.
I actually know someone who had basically an ongoing fight with his wife because she wanted a third, after two HG pregnancies which sound very like yours. In the end he gave in, but he was like a shell of a man: she was hospitalised from four months, he had to get special dispensation to work from home to support all childcare drop offs etc, he basically did everything. At least he knew in advance, and your Dh is also going in well prepared. In his case, he was happy for a second and reluctant for a third, though they are still happily together as far as I know.
In my case, I've had a HG pregnancy (only 12 weeks) for the first time with my second. I was only really sick for a week or so then I was put on meds which massively helped, but I've still required DH to do most of the heavy lifting. I've still not been my usual self with our toddler, and so she's started waking in the night, and is much more clingy with him, all of which DH is dealing with. He is totally stepping up and not complaining but he is exhausted, doing all meals and houseworks on very disturbed sleep and that's with my having medication that is 100% working.
In your shoes, I don't think your demands are especially unreasonable. I would really prioritise doing research in advance, while you're able, into drugs - even in a few years things have improved - and into 'best practice.' You are possibly really going to need to push. Its much better to have done all that thinking in advance. There are HG threads on here v helpful for info.
I'd also think through contingency plans for childcare, and how much support you can draft in if needed. Its very unpredictable.
But in terms of an induction - my husband is very involved, and engaged, and at absolutely no point did I think a single choice I made about my pregnancy or birth had anything to do with him. He is an equal parent, but its my body. I'm having to weigh up c section or not now and basically, I'm going to be dealing with the fall out of another tear or potentially the after effects of a section and I am making that call. I don't think you should be thinking he gets to input, no matter how well meaning he is.
Good luck with whatever you decide.