I'm getting hints that long-term you might want to do a bit of customization yourself, even if you're not inclined to do so at the moment.
Just FYI, you can add D-rings or move d-rings on just about any harness, so if a commercial, one-piece, or DIY doesn't have enough you can almost always add more. The exception are typically your BCDs designed for new divers, that don't have a backplate or separate harness.
You might also want to look into pouches as well, since it sounds like you carry a decent amount of equipment. In Sidemount (and some backplate diving), it's common to have a "butt pouch" which clips on d-rings or rails around the back or bottom of your harness or backplate. You can also attach a "butt plate" which slightly extends your harness downward, along with the rails being slightly lower.
For that you can do something like:
- Option 1 - my preferred is something like this, an inexpensive nylon one with a couple rails. There are also name-brand ones for around 3x the price. I've also found this style tends to relive some pressure from the crotch-strap.
- Option 2 - Single plate. Alternative style. Attaches to crotch-strap in the back.
- Option 3 - Two of these. alternative style. Threaded through webbing in the back.
There are a bunch of other styles out there of all of the above.
Piranah Dive Mfg has a good selection.
You can also use the rails as another clip-off point.
You might also consider what can be moved to your wrists. For example, people sometimes put
line cutters on their dive-computer-wrist-band.