So a lot of what youre asking for has been answered elsewhere probably but you actually typed out a decently well thought out post with your plans specific to you, as opposed to asking super short generic questions. So you’re gonna get more people actually answering the questions.
VR: Quest 3(Not the 3s(is weaker)) is probably the easiest option to just go with. Is standalone and you can just use it with the single-axis strokers without a PC involved if you really need it to. Multi-axis requires a multi-axis player so you would either have to do do the mirroring to play w/e is on PC on the headset. However the wireless is pretty good for the most part so its not that bad.
Note: You will be buying accessories for the Quest3 if the stock gear is as bad as the Quest2 was. Probably need a new headstrap that distributes weight more evenly, probably want a new facial interface. Batterybank required if you’re going for longer sessions wireless.
Multi-axis: Your options are basically SR6 or OSR2 as a form factor.
OSR2 has 2 more axises(tilt left/right and tilt forward/back) than TheHandy. SR6 has that plus moving the stroker laterally left/right and forward/back. Usual opinion is that going from single axis to OSR2 is a massive leap forward, OSR2 to SR6 is marginal leap forward. Still improvement but for the price increase its not that much.
They dont have to have a twist receiver, a lot of people recommend it though. Most people don’t recommend the lube. ‘suction’(is just a valve that opens or closes depending on if stroke is going up or down which create a vaccum/sucking like sensation, this basically does the same thing, you can buy the boost sleeve or just the case. I personally recommend the case because the suction does affection the sensation. Heat’s alright but not necessary.
Both of these devices require both power cable and usb cable(for data) cause they’re usually not bluetooth/wireless. I believe they’d also be too heavy for a belt/harness, VESA mounted on a monitor arm is the most suggested option.
For sellers, there’s craftyhandy, vespera or g90ak.
Shouting out @g90ak is one of the more well known OSR2 sellers(I got my machine from him). Doesn’t sell his models with twist, so you’ll have to aftermarket install that yourself(its easy). In exchange you do get access to his huge repository of scripts for just his customers. He does limited quantity drops at the beginning of the month and the middle. These are fully finished models(other sellers have a lead up time for building) so you get them within a week or so after purchase.
Also: Turning Single-axis Scripts into Multi-axis
Games: IDK about setup but the most commons ones used with stroker integration are like Virt-a-mate or Honey Select. You can also go through the game integration category here.
Other things you can do: Cockrings to restrict bloodflow since it does affect sensation and erection length.
Prostate massager, Edge 2 has a vibrator on the massager that goes inside and on the outside so you could have 2 separate vibration scripts.