Back to the wall toilet, in wall tank but floor, not wall mounted

[pnw condo]

Tiny bathroom where every inch counts. Looking at replacing a 1979 standard toilet with an in the wall tank to gain a few inches. BUT its on a slab so switching to a wall mount toilet is not only unnecessary, it would be a problem because you'd have to jack hammer the outflow in order it gets it flush ( I think) and then install new flooring. So I think the solution is a toilet like this that backs to the wall. https://www.wayfair.com/home-improv...-one-piece-toilet-seat-included-mjeb1034.html
I've been searching products and there is a Swiss Madison and Gerberit in-wall tank available (I understand that Gerberit is better). https://focalpointhardware.com/gebe...ealed-cistern-12-cm-6-3-liters-p-167000.html?
But the toilet options seem very limited. I've found only this https://www.homedepot.com/p/Swiss-M...Bundle-in-Glossy-White-SM-WK514-01C/320473696 and the one linked above. So my two questions are 1) Am I right that and in wall tank with a standard floor discharge 12" rough in is the right solution? 2) Does Toto or other higher quality makers have a back to the wall toilet option? The in the wall tank description implies that any toilet will work but that doesn't make sense to me.

 

[pnw condo]

Tiny bathroom where every inch counts. Looking at replacing a 1979 standard toilet with an in the wall tank to gain a few inches. BUT its on a slab so switching to a wall mount toilet is not only unnecessary, it would be a problem because you'd have to jack hammer the outflow in order it gets it flush ( I think) and then install new flooring. So I think the solution is a toilet like this that backs to the wall. https://www.wayfair.com/home-improv...-one-piece-toilet-seat-included-mjeb1034.html
I've been searching products and there is a Swiss Madison and Gerberit in-wall tank available (I understand that Gerberit is better). https://focalpointhardware.com/gebe...ealed-cistern-12-cm-6-3-liters-p-167000.html?
But the toilet options seem very limited. I've found only this https://www.homedepot.com/p/Swiss-M...Bundle-in-Glossy-White-SM-WK514-01C/320473696 and the one linked above. So my two questions are 1) Am I right that and in wall tank with a standard floor discharge 12" rough in is the right solution? 2) Does Toto or other higher quality makers have a back to the wall toilet option? The in the wall tank description implies that any toilet will work but that doesn't make sense to me.

Bump due to no replies. Help please!

 

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[Tuttles Revenge]

The problem that you're going to have is mainly getting the rear discharge toilet to connect to a floor flange. The first time I encountered a Duravit toilet it came with an adapter, to connect to the floor, but the flange needed to be set at 9" from the finished wall rather than the 12" standard. The inwall tank would be a good way to save about 9" of space.

This is similar to the adapter that I got to connect the toilet to the toilet flange at the floor.