No, there are quite a few limitations using Zone 2 in the X1200W. A Wiim amp is basically a mini stereo receiver that would connect directly to the outdoor speakers and be a stand alone system. It has its own app as it is network connectable. If the X1200W supports Airplay 2, not just Airplay, one could stream music from a Smart device to both the Denon and Wiim or just to one or the other as needed provided they are all connected to the same wifi network.
The X1200W does in fact have a Manual EQ. It also supports Front B speakers. So, with some very specific settings concerning sound mode and speaker configuration, one could use the outdoor speakers using Front B speakers, not Zone 2 and be able to adjust tone and EQ and not have the digitally connected external source device limitations of Zone 2. But, this means using the outdoor speakers when nobody is using the indoor speakers. Connecting the outdoor speakers to a Wiim is a simpler affair.
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If interested in experimenting with Manual EQ and the outdoor speakers. Go into settings and change amp assign from Zone 2 to Front B. This will support 5.1 in Main Zone with an option to turn on Front B speakers in place of Front A speakers or use them at the same time when selecting A+B. Then, set Front speakers to Large and Subwoofer to LFE, not LFE+Main. Select Front B speakers, not A or A+B. Stream some music with the Denon in Stereo mode. Sound should only come out of the outdoor speakers if set correctly and Manual EQ and Tone settings should be applied to them. This is a chore to do manually each time. The new upper level Denon receivers can do these things automatically using new features for two channel music playback output from different speakers.