its a hex head? so it sounds like a through axle? you can get them but you would have to know exactly what it is the right length and thread and size. there is no standard. my trek has the hex but my tandem has a shimano quick release. so no tools but you have to work out what one you need so going to a shop is the best way.Yeah, I had a closer look and would entail all of that. Not really worth it. Actually the hex head bolt is probably more secure anyway. Just have to remember to carry that allen wrench in the tool kit now!
there are Qr's for through axle but its more like a lever flip and unscrew. but no tools needed. we have on on the tandem.It is a thru-axle. No can do. Just carry an Allen key. A thru-axle is better. No adjusting the brakes each time the wheel comes off for transport. It is faster to change the wheel and stronger for safety.
Well, I owned a Giant Trance E+ with QR thru-axles and I admit I even liked it, as I did not need to think of the tightening torque after the wheel replacement. The QR handle moved to the usual position (12 o'clock) will tighten your wheel at exactly the same torque (or rather, strength) each time.As I mentioned in a previous post, the existing axle is probably more secure than a QR unless you make a habit of removing the wheel and taking it with you all the time. Pain in the butt AFAIC.