why do you think this? I'd personally recommend 25 c nbome to OP. It produces very colourful visuals and has (in my knowledge) no bad short term effects on the body. Timber, I'm sure you will be at a better place when u pass away, before you will prepare for your next journey. peace.
In my experience both 25I-NBOMe and especially 25C-NBOMe actually cause a significantly larger increase in heart rate and blood pressure than even something like MDMA - he said he wanted to avoid MDMA for this reason, so I highly recommend against the NBOMes if this is the case.
Even health aspects aside, while I do think the NBOMes are great experiences, in my opinion and that of many others here they're definitely very shallow compared to other psychedelics, and I think someone who's a huge fan of acid might be disappointed. They're definitely a worthwhile an experience, and a great one at that, but even as someone who does like them a lot they're not something I'd choose for such a meaningful experience - they're more one of those things that are suited for having fun and just enjoying the visuals.
YMMV of course but regardless if you're worried about taking MDMA for the reasons specified then I'd stay well clear of the NBOMes.
Regarding the tripping several days in a row thing - well, it works, but personally it's something I avoid except for multiple day festivals where I want to be in the zone the whole way through. This is because I'm looking for pure recreation at the festivals though and so needing a higher dose and losing most of the depth the 2nd and 3rd day don't bother me, but if you want your trips to be just as magical I'd definitely space them out - even if it's only a day or two between each trip that'll make a huge difference over taking it days in a row.
I think the ideas regarding mixing up psychedelics and dissociatives are along the right lines too and definitely worth considering. Dissociatives are a crazy ride and something definitely worth experiencing before your time on earth comes to an end. I'd argue that MDMA definitely is too, but you do have good reason for being cautious about using that, and if you were to go for it I'd recommend only going for a lower end dose, like say 80mg.