Background:
I have set up Simply-Automated UPB switches throughout my house. I love them and think they’re amazingly powerful. But I’m having some reliability issues with them now (@10yrs old). I use HomeKit. Never Alexa nor Google. I integrate them using Home Assistant but that integration forces them to be treated as lights, not switches which does odd things. Looks like <30 people are using that integration so I’m a bit worried support will fade especially since it seems like the company making the switches has folded when the owner died. Also, the supposed great UPB power line based communication is less than 100% so fails wife approval. I have an IT background and am handy with tools and electrical. These switches are nearly perfect if only they were a bit more reliable, easy to connect to HK, and still on the market/vendor supported.

Existing switches can be configured with single tap on/off, press and hold to fade up/down, built-in timer to control fade speed or auto-off after a time, double tap to control another switch or trigger a scene with an on/off argument (which confuses the hell out of automation hubs that don’t allow for scenes to have an “off”).

Basic switch: http://www.simply-automated.com/products/items/US11-40_single_rocker_dimmer_controller.php
Dual load controller: http://www.simply-automated.com/products/items/US22-40_deluxe_dual_circuit_base.php

Question:
Looking for a set of wired, load controlling smart-switches that integrate readily w/HomeKit to replace the UPB ones. They should have no requirement for a specialized installer (DIY-able at least if not DIY-friendly). They should support on, off, fade/dim up/down, and double tap on/off or similar approach to allow limited scene control from the switch without requiring a dedicated scene controller device. Bonus is configurable dim rates, guide light behavior/color, double load controls (with doubled paddles), switch able to be separated from wired load and just trigger scenes.

I like the Lutron Caseta Pico remotes, but looks like the Diva/Claro switches are a lot less capable (just on/off/dim and remote control) and I don’t want to have to put up a bunch of extra Picos to replace what was built into the prior switch tech. Or am I missing something?

Current double-tap use cases:
Double-down in master-bath: fires a scene giving time to get into bed while the lights are still on.

Double-tap down(off) in other areas does a similar scene as appropriate for that area.

Double-tap up(on) triggers certain arrival type scenes.

Currently use different colors on the guide lights to indicate if light (green) or fan (blue). Light on means load is off, light off means load is on. Shades of Harry Potter (the switch catches and releases the light from the bulb). Kids loved it.