I will remove the toilet but do not want to go underground. This is in a bathroom with 2 toilets and a sink that are vented, all in an industrial tilt up rental unit. I am looking for a connection and alternate trap and anticipate building a platform over the slab.

We can't be of much help because you've failed to provide us with any details, Age of house? The material the pipes are made of. Do you have enough head room to platform a shower floor and enclosure? And why just as temporary one?
Why not do it right and open up the slab, remove the closet bend, convert to 2" add a trap and raiser and patch the opening. The shower will cover the patch and you'll have a shower that doesn't look like it was built as a after thought. Let me know what you decide. Good luck, Tom

Thank you Tom. Your input is very valid. The answer is in the cost. Our landlord gave a bid of $7,000 to accomplish this.

The location is a office building with 2 bathrooms, 1 women and 1 men. The women's room has 2 toilet stalls and we have no women working here. The room has a 8 foot ceiling. We also have 2 years left in our lease and will need to remove all when we vacate. So I am looking to put a platform over the toilet opening and hoped there was an aftermarket product that would go on the exposed toilet drain line. Or, other alternate methods to get the water into the sewer drain without the odor release. Do either of these get me in the right direction?

The SureSeal Inline Floor Drain Trap Sealer
HepVO hygienic self sealing waste valves

There are 2 problems: toilet does not utilize trap and it is going to take some effort to attach 2" pipe onto existing 4" closet ring. But if you don't mind building platform, do this:

1. Remove Closet Ring rim
2. Chip off about 1" around the pipe exposing upper end of Closet Bend
3. Install 4" x 2" Fernco coupling over Closet Bend
4. Build platform, not lower than 12"
5. Attach 2" - Street 90 into the 2" end of Fernco coupling
6. Run short pipe towards your shower base
7. Install trap
8. Install Shower Base
9. Test
10. Continue assembling shower as usual
11. Take H / C water supplies from sink supplies

Shower will utilize toilet vent.

Advice: consider Ariel pre-fab showers. They come all assembled with faucets, shower heads, shower pans, shower doors, etc. You just connect drain and H/C supply with flexible hoses. Ariel shower is probably the way you want to go...

Ariel Steam Showers, Designer Steam Rooms for your Bathroom

Good luck. Let me know how it went. Milo

With Ariel shower, you can do the entire job for $2,500 yourself or pay extra $1,500 more for plumber...

Thank you so much Milo.