I have looked into this as well. FXTeleport seemed to be the best option. Especially for being able to run more VST's. The latency is pretty high (DAW will compensate) and it is pretty network intensive. Oh and it doesn't forward the interface. So you will have to use Remote Desktop, or something like that. For your task I don't think it will help.
Even if the DAW supports multi-hosts, it is hard to say if that particular operation is even multi-threaded to be able to utilize it. Same would go for a multi-CPU system.
Drum editing resizing, my guess would be CPU, RAM, and HD intensive. I would think it could be threaded, but that would depend on the algorithm and the programmers.
Back to FXTeleport, in the end, with the cost of the software and the prices of hardware these days, I decided to just build a new machine. I built a pretty awesome machine (AMD Quad Core, 4 gigs RAM) for $500 and re-used the drives, case, and OS of my old one. Just the other day I built a pretty awesome machine for $565 with everything (AMD Dual core 6000+, 4 gigs of RAM, 500GB HD). With a few tweaks it would be perfectly suitable for recording.