I'm in the process of doing some renovations and taking the opportunity to try to install some smart home devices.  My home is >100 years old so I don't really want any of the current offerings of smart switches as they just don't fit in.

Ideally I want everything to be HomeKit compatible and the only realistic way to do this I think is to use non-homekit gear and then bridge with Homebridge, OpenHAB or Home Assistant.

I may migrate to a Raspberry Pi but thought I could use a spare Mac Mini (c 2009) I have which isn't really being used.

This is what I am planning to do - I welcome your advice about any tweaks or comments before I take the plunge.

Aeotec Z-wave USB stick

Aeotec nano dimmers (can these be hidden in a fit and forget or do you need access to the button? also can they still work if there are 2 light switches?)

OpenHAB

Home Assistant

Homebridge

I don't know which of the above is 'best' so what are your thoughts?

I already have some Hue bulbs and a bridge v2 as well as Amazon Fire TV 

I had considered Vera or Homey but thought this was a cheaper way to test it out before going that way.

Thanks

Andy