I doubt I would use a compressor unless I had no other option. The "oilless" versions might be OK, assuming you get all the moisture and rust and dirt drained out of the tank, but the volume of air is going to be rather low unless you have an industrial setup. As for the leaf blower, might be fine right up until the time it picks up some type of debris like sand and peppers your paint job. May never happen, but without a filtered air intake I wouldn't trust it. And it tends to be a little unwieldy trying to get into tight spots.
If you have a shop vac, see if it has an exhaust port that you can attach a hose to. If you attach a 1-1/4" hose to the exhaust port of a vac, and add a crevice tool as a nozzle, you will have higher volume but lower pressure air that is filtered by the vacuum bag and warmed a little by the motor. Similar to those specialty bike dryers, without the expense (except for the hose, I recommend a dedicated hose for drying rather than using the one you use to suck up dirt and debris). I've been doing it this way with my Craftsman shop vac for ages, and it works every bit as well as the dedicated bike dryers.
Jerry