The backspace is going to be 4.25 on those wheels. So using adapters that are 1.25" thick is going to give you an effective backspace of 3.00". It's going to look ridiculous and be dangerous as well as hard to align properly. You may also have serious rubbing issues.
I'd strongly recommend buying proper wheels for a JK. I'm a big fan of 15s for multiple reasons, but if you go with 17s try to find some tires that are lightweight if you can.
'92 YJ - heavily modded
'96 ZJ - heavily modded
'05 KJ CRD Limited - 370 lb./ft. from a 4-cylinder and trail ready. Pure awesomeness.
'11 Mango Tango JKU Sport - Mods
'12 Dozer JKU Sport S - 6-speed - ACE rock rails - Max Tow package - Daystar spacers - 33x12.50 Duratracs