If the marina has no objections to you running wires from both piles to the floating dock - you can set up a simple system to use.
We have used this set up in past marinas
and it works exceptionally well not just when shorthanded, but also in any form of blow.
Rig those two wire lines tightly between pile and dock using rigging
Running between the two wires have a crossing line parallel with the dock - but with blocks each end attaching that crossing line to the two wires.
Have two stoppers on each side wire, so this crossing line will prevent your boat to reverse all the way in and ram the dock.
At the right distance on the crossing line - decided by the placement of one of your most easily reached stern cleats - have a loop built into the line.
Have regular mooring
lines to both piles and the dock.
When you depart the dock cast off all regular mooring lines but tow this crossing line out to the pile end of the berth. amd leave it there running across the berth.
When you come back in, simply reverse in and picking up this loop, drop it over the cleat, and continue reversing as you go forward to pick up your bow lines off the pile with a boat hook.
The cross wire will keep your stern correctly located from side to side, and the stopping fixtures will prevent you ramming the jetty.
This set up works even better if you go in forward - drop the cross line over the bow cleat and then pick up the stern lines from the piles at the boat comes to a halt.
Hope this is clear enough for you to understand how it can work. Good luck.