This should possibly be made more explicit, but those things are supposed to be covered by the "general integration difficulties" part in the problem section. I'll expand on it.
The paper isn't really attempting to be a conclusive knock-down argument that demonstrates for certain how mind coalescence could be achieved. It's mostly just introducing the idea and establishing that this should be possible in principle. The actual gritty details of the implementation are for later work to deal with.
http://www.xuenay.net/Papers/CoalescingMinds.pdf
Like my other draft, this is for the special issue on mind uploading in the International Journal of Machine Consciousness. The deadline is Oct 1st, so any comments will have to be quick for me to take them into account.
This one is co-authored with Harri Valpola.
EDIT: Improved paper on the basis of feedback; see this comment for the changelog.