The problem is at this age, going away for a couple of nights doesn't always work. That's a weaning technique that works for babies and young toddlers, because it's long enough to interrupt the pattern for them, but older children remember and expect to carry on when you get back.
The taste also won't work unless he's on the verge of stopping and just needs a nudge.
Clothing can help if combined with other techniques such as building up a lot of distraction or even swapping for a reward (similar to dummy fairy type thing) - but again if child is very attached/dependent this may be harder.
I fed DS1 until he self weaned, I thought he would never stop but he did. They do all stop by themselves. It just might be longer than you imagined.
I had to stop with DS2 as I was so fed up, I had aversion and it was really bad. But he wasn't as boob-obsessed. He barely even fed in the daytime to start with, so I was able to say no just wait until nap time, and then he dropped his nap, so it was only bedtime and during the night.
I managed to get him off the night feeds by building in a delay before he fed and cutting him off before he came off by himself, then I'd rock him so he was soothed, if he was sleepy enough, this would eventually put him back to sleep.
Children with neurodiversity (ASD, ADHD etc) anecdotally seem to rely on breastfeeding longer than their neurotypical siblings/peers. OP you mentioned frequent tantrums and sleep issues as well as the high reliance on BF - it might be something to bear in mind.