I have yet to read nor hear of anyone actually doing this and yes, it would make a formidable 4 or 6 voice analog poly...but also a very expensive one, as -4- Pulse 2's would cost as much as a Prophet 6 here in USA (4x$700).
I have Pulse 2 and still own my classic Waldorf Pulse+ rack and do know that although the software has been made to allow polychain, also know that almost every Waldorf User Manual towards the end will mention in their great "Waldorf Humor" something along lines of, "Once you have purchased 6x of [insert instrument name], you qualify for a dinner with the Waldorf Team.
The original Pulse is able to have up to 8 polychained as well.
If you can eventually find a Pulse+ (Plus Model has various cv/in/outs/gate and midi->cv/cv->midi convertor), you can utilize the Pulse 2's cv/gate outs to trigger the Pulse+.
A Poly Pulse with a very knobby interface would be a formidable synth but at some point I imagine the 'market' will reach the 'oversaturation of analog', simply due to so many options out there and making something like that at an affordable consumer cost would place an exclamation mark on the actual bang for dollar the Sequential Prophet 6 is at $2700. A Moog 'equivalent' poly would easily be 3 or 4x that price if not more.
Without taking the Pulse 2's paraphonic 4/8 modes, if you detune those great oscillators to make a "mono chord/5th, et al" and run that through FX you will
have happy ears.