I'm fairly sure it could be done. In particular, I was thinking to integrate/mount it upside down under another blaster. You'd have to make a new pump grip (maybe it could slide along the tactical rail?) and then attach it to the upper "sled" that pulls back the plunger rods. If I remember correctly the upper sled is also what hits the slamfire, so if you're okay with permanent slamfire you wouldn't necessarily have to relocate the trigger in this configuration (use thisor DIY it).
Or, yeah, you could probably directly link the stock pump grip to the upper sled.
Anyway, I encourage you to try it and post the results!