How longer term are you thinking? 40 years so far and not planning on it going t*ts up. I know no-one does and sh!t still happens sometimes, and maybe my luck will run out before I pop my clogs but there's no need to be so worried about it.
If you or I get a complication, it's unlikely to sweep us off our feet suddenly and it be 'curtains'. And there's a lot of things that can be done about most complications - even gastroparesis - these days.
Do the best you can do! - eat normally - mixed proteins including all meats, cheeses, eggs, white and oily fish, natural fats (butter, olive oil) loads of different veg, stay away from sweet stuff, processed and junk food except on special occasions, keep slim and active. Alcohol in moderation. (except on special occasions, LOL) The foodstuffs that make you fat and sluggish are exactly the same things that are bad for diabetes!
Yes I now have an even fatter tummy than I did when I was a teenaged 7st 12 - hip bones stuck out and ribs you could count - and my tum still stuck out. And now I'm a 36B instead of a 34B. And my waist is nearer 30 than 26. And some of my hair has gone grey and I have wrinkles. And I'm more bothered about the last one than all the rest put together, TBH. Or, indeed, getting diabetic complications ........
If I had that ?5k to spend on a diabetes cure we were talking about, perhaps I'd rather spend it on tummy liposuction or an inner thigh-lift instead !