The traveler being "up front" when the boat had tiller steering made a lot of sense. Easier on a short-handed crew or when single-handing. ISTM that with wheel steering, now, and assuming the wheel's at the back of the cockpit, it may make as much sense to move the traveler back to either the back of the cockpit or just in front of the wheel.
Faster's already pointed-out one of the big problems you're likely to encounter in moving it to behind the wheel: It's almost certainly occasionally (?) going to be in your way when you're trying to stand behind the wheel.
From what I've been reading...
If you're concerned about performance, there may be another consideration: Moving the sheeting back will reduce the mainsheets effectiveness at flattening the main. This is because, as you move the boom off centerline, past a certain point, you'll have more angle on the mainsheet, more quickly, than you have with your current sheeting. This will be exacerbated if the traveler is also behind the sheeting point on the boom. To easily see what I mean: With your current setup: Sheet the boom in tight(-ish), move the traveler car to one end, and see where the end of your boom ends-up.
You'll be able to use the boom vang to compensate. You may want to upgrade its tackle, however. In heavy air you may need to reef sooner.