I get all the sides.
I'm also not 1 to play complex stuff when in front of an audience, unless if there atmosphere is just right for it & it happens instinctually on that " Holy Spirit surge" (which is mostly when I'm alone anyway!)
Anyway, the easiest way I find doing that "going-out" thing, if I understand it correctly, is by utilisation of the chromatic scale
[don't really have the time to spell that out for now
So what I normally do is find various chords to play with the "off" notes that are not part of the particular major scale I'm in..& then I just play my progression & resort to a 5-1 to end off or something.
If you struggle to come with stuff to play with the off notes, trust your diminished chords to work
or try the dominant chords as well.
It's all really a matter of you sitting in front of your board & compiling a list of all possible routes U can use to move from 1 pt to the other.
for instance, if in the key of Ab, you could play: (just recalling from memory here, excuse any errors)
Db/ B-Eb-F-Bb
B/Bb-Eb-Ab
Bb/C-Db-F-Ab
B/A-Db-Eb-Ab
Bb/Ab-D-G [2]
Eb/G-C-Db-F [5]
Ab/ G-Bb-C-Eb [1] or Gb-Bb-C-Eb-(F) (to end off) or you can go to key of Eb
from the 5 of Ab..so play:
Ab/G-Bb-C-Eb-F (this effectively takes you to the key of Eb
D/G-Bb-Eb or D/C-Eb-Ab
Eb/Ab-D-Eb-^F-G ^=trill
---
just an idea..
Another example (if I'm on track), if you are playing in the key of Cb, you could do something like this which will take you to the key of F:
Key of Cb
Eb/ C-Db-Gb-Bb
D/Cb-Eb-F-Ab
Db/Ab-Eb-E-Bb
C/Bb-D-F-Ab
Cb/A-D-^E-Gb
Bb/A-C-D-F
the next part is just me going on top & using different ideas:
Eb/Gb-Bb-C-Db
D/F-Ab-Cb-Eb
Db/Ab-Bb-Eb-Fb
Gb/A-Db-Fb-Ab
Ab/Gb-Bb-Cb-Eb
Db/Fb-Ab-Cb-Eb
C/Eb-Ab-^Bb-Db
Cb/Ab-Bb-^Db-Eb-Gb
To key of F:
Eb/Bb-C-D-^F-G
emergency,to be continued later
I'm also in process of compiling a chord chart adapted from KC's "number system"..
I'm just having fun making progressions from chords I extract from any key..