by using a saniflo and pump
Is there a bathroom or rough-in already there?
NO,NO,NO, NO UNLESS you do not mind having stoppages constantly as fixtures should never be DOUBLE TRAPPED.
You don't have to have one, it just makes it a little easier. As long as the drain is flush with the floor, you can drill into the concrete and us anchors to hold the toilet down. The down side is...
You can build a platform to raise the toilet enough to connect to it or get a wall mount toilet and frame a wall to hang it from.
Sure ... might require some special pumps and plumbing, but it could be done.