Yes there is. You have the rope in your tacklesack. So use it.
Rigging should always begin
before you are in danger of falling down a pitch. Before approaching the drop, your rope should be attached to a bombproof anchor (typically comprising two good bolts).
If you can reach the bolts to clip in with your cowstail, you can also attach the rope to them. Your arms are the same length in either case.
Now use the rope for safety while you approach the pitch. First clip into the knot you just rigged, using your cowstails. Then progress along the rope using your jammer or your descender.
The jammer is usually more convenient; to progress, carefully disengage it without removing it from the rope. While rigging, keep the jammer under tension as much as possible. Ensure that the jammer's carabiner is also clipped around the rope, so that the jammer will load correctly in a fall. To pass intermediate anchors, first clip your short cowstail into the knot loop at the anchor, before transferring the jammer to the next section.
...but if you can reach the P-bolts to clip, then you don't even need the jammer. Just clip into the knot loops as you go along.