completely stock Create Trainyard crane. features remote controllers, extendable length, and tailor made for my Stock Cargo Wagon BP.
https://createmod.com/schematics/stock-cargo-wagon-stock-create-6-0
(though you can trim down the arm at the end to be just the singular sticker, if you'd like.)

Startup:
Apply rotational power to any of the encased chain drives below the lecterns.
craft two Linked Controllers and give them the configuration below. (screenshots provided)

Controls
Controller 1:
<- |Light blue| slides the crane to the left.
-> |Purple| slides the crane to the right.
[Space] |Lime| toggles the Stickers.
Controller 2:
^ |Yellow| Extends arm 1 block forward.
v |Green| Retracts arm 1 block backwards.
<- |Blue| Pivots crane counterclockwise.
-> |Red| Pivots crane clockwise.
[Space] |White| Reels crane hook upwards.
[Shift] |Black| Reels crane hook downwards.

Known Quirks:
You have to keep some of the directional buttons held down, otherwise the crane will change direction unexpectedly.