Here is an overloading sugestion:

Unprotect@File;
File/:DatabinAdd[mybin_Databin, File[packPath_]]:=Module[{},
    DatabinAdd[mybin, <|FileBaseName@packPath<>"`"->Import[packPath,"Text"]|>]
]
Protect@File;

So, to add you package into a Databin, just do:

DatabinAdd[Databin["3GUtgBVI"], File["/Desktop/dropTest.wl"]]

Now, to load it, let's work with Get:

Unprotect@Get;
Get[pack_String,Databin[id_String]]:=Module[{databin=Databin[id]},
    Get[pack,databin]
]

Get[pack_String,databin_Databin]:=Module[{packContent,path},
    packContent=Lookup[databin["Values"],pack,Return[$Failed]][[1]];
    path=FileNameJoin@{$TemporaryDirectory,StringReplace[pack,"`"-> ""]<>".wl"};
    Export[path, packContent, "Text"];
    Get[Evaluate@path]
]
Protect@Get;

Now, to load you package, just do:

Get["dropTest`", Databin["3GUtgBVI"]]

now:

myFunc[1]
2