A few points before an advice has any sense :
- you're running a SE, you said. So you're certainly running representation. This makes a settled great person, regardless of type, very useful.
- What victory condition are you gunning for? If it's cultural, you may build the parthenon in another city, for quick culture + the effect won't be wasted at all. If it's not, but you aim for a quick conquest or domination, the temple of artemis is great. (read sisiutil's current ALC

)
- lightbulbing MC when you don't have alphabet isn't a very good move. Of course, if you go this way, you can research alphabet the slow way and still get good value out of it. How many turns are you away from alpha?
So my conclusion :
1° if you're not running for cultural (there is no way I can tell from what you've said. If I missed something, sorry for this),
2° if you're able to build the wonders you want (because you are industrious with the right resource)
3° if you are a good deal away from alphabet (more than 10 turns)
settle your engineer in your wonder production city. You will get the wonders faster than without him + you'll have a good deal of science coming from him, and not only for MC but also for the rest of the techs, including those smaller techs you don't want to trade for.