It all depends on what sort of mashup you want exactly. Keep in mind that some of the official cornes have a break-off 6th column so you can get close to the same key count as a Sweep (36 instead of 34). Here are some that might come close.
jcmkk3
joined 1 year ago
I have to admit that I like this almost better than all my Ferris Sweeps. Time to order another one.
Do you mean one 2u key in the middle instead of the two? If so, that's an option.
I use a 30 key keyboard and do not use homerow mods. It is definitely possible. I use mods on a layer. Callum (sticky) style mods on a layer are also an option. You can see my layout here: https://github.com/jcmkk3/zmk-config