1 and 2 are not all that practical. Cords on the DC side are not readily replaceable, at least for units I have seen,
Properly done 3 is OK. Just Be careful about long term (months or longer). Some power bars (good quality ones) have decently long cords, and so you may be able so safely use a power bar to accommodate your needs. I use power bars very safely.
Best solution: Get an electrician to put an outlet near your desk.