The Blue Ripper Jr looks more like what you'd need for occasional use.

https://www.diamondtoolstore.com/achilli-track-rail-saw-tsa-3hp/

I think I've seen them- or something just like it- for rent, although owning is usually a better bet if you need it more than twice

Thanks for the info everyone, i never even considered renting, I will look into that.
I also found a Rubi TC125 that seems like what I am looking for , I will compare all the models mentioned.
Rich,
I agree with you that I don’t want to do it and it should be a different trades work, but sometimes it saves us a bunch of time if we don’t have to wait 2 weeks or more for someone else to show up, or even worse when no one wants to do it.
Alan,
I agree with what you said about cutting on site, I think the dust is a serious health issue, just like certain kinds of finishes can only be sprayed in a spray booth. I would only cut or polish wet and off site as the water is key to safety and also messy.

I have seen it done with a skill saw and a stone blade and sponge and some water.

The straight edge won't do much good though as there is a lot of pressure on the saw. I think they just put down white masking tape (as it stays stuck in water) and put a line on it to follow.

What would it hurt to try it this way.

Not a big deal really

On second memory I think it was a diamond blade and an angle grinder

I bought an unbranded 5" handheld wet saw with a garden hose adapter and flow valve. Use a waterproof marker as the guide line, cut slowly, no dust, takes up no room in it's plastic storage case and has been very useful for the half a dozen times I've needed it over the last 10 years. Probably didn't cost more than $100.

I have cut a quartz top with a skill saw with a Dimond blade. I wouldn't want to do a lot of them but it was in a quick remodel situation like you are talking about. I clamped a straight edge to the top for the base to ride against. It really wasn't hard to do but you have to go slow.

I own a makita hypoid with a Bosch diamond blade. I use 1/2” plywood jig to cut to my line a lot like a festool track saw. Have water line on it

I also own a makita grinder with 4” diamond blade.

A metabo polisher. That’s the field stuff.

We got started in the shop with Accuglide Rail saw. Then up to a small bridge saw.

Now we are digital with a Sasso k600 and cut about 10 jobs a week. Stone install truck with crane.

I started because I got tired of being f’d around after I gave them 50% up front and they would never show up

Thanks for all the suggestions, I will definitely look at them.
Cabinetmaker,
I have no intention to get as involved as you are, but my frustration is probably similar when small jobs delay everything.

Scott,
This is not difficult.
I had a project this past summer, an outdoor kitchen hardscape project.
The homeowner wanted to save a few dollars by using 3' x 4' slabs of travertine 2'' thick.
I just used my old beat up Makita worm drive with a diamond blade, garden hose, and a clamp and guide. Not rocket science.
PFD