Hi,
I am not sure which version of ArcPad you are working in but within ArcPad 10.2. Our developers incorporated an awesome workflow, which would allow you to only access ArcGIS Server ArcPad Services.
So, what does this mean?
In ArcPad 10.2x they have created a workflow were you will check out your data and create your service(s), then append the two using a new ArcPad Tool within ArcToolbox. This is all covered within the following blog written by them. I hope this addressing your question but allows you to take advantage of this new workflow and tool within ArcPad.
Gracias!
Server
http://resources.arcgis.com/en/help/arcpad/10.2/app/index.html#//00s100000012000000
Sync with Feature Services in ArcPad 10.2
http://blogs.esri.com/esri/arcgis/2013/09/22/feature-service-sync-in-arcpad-10-2/
Juan