I am new to LM forums here however my linux experience dates back since 2000 (my first distro was RH desktop 5.2).
I also have fair share of experience with running Ubuntu and BackTrack on Arm Devices (ch-rooted mode)(http://forum.xda-developers.com/showthr ... ?t=1028464
and http://forum.xda-developers.com/showthr ... ?t=1074169
Now making my context clear here is my opinion on the topic in consideration.
1) Linux Mint would actually be a good edition in the Arm Tablets range.
2) As rightly pointed out we will require ARM edition on Linux Mint.
Besides the method in which i am familler could be done by just getting point 2.
however in order to achieve pure dualboot we will also require proper kernel with drivers specific to each device and this specific task makes this whole efforts very troublesome.
some of the efforts where made based on my work ealier (forum.xda-developers.com/showthread.php?t=1079898) however as you can see they are also marked as unstable at this point.
so the best bet is to select one hardware and focus efforts on that specfic hardware.