Juha,
I would prefer it if it were possible to use spd cleats when cycling and to just not attach them for this holiday.
Not just because (as you rightly say) walking with the cleats is not really comfy / secure for longer periods of time and or scrambling over rocks.
Plus they tend to scratch floors if not careful, since we'd be doing hostels etc. this year I would not be comfortable walking around indoors.

Really, what I'm looking for is the opposite of the normal mountainbike spd shoes (like those I have now),
instead of bike shoes that are usable off bike I'm looking for trekkingshoes that are usable with spd cleats (if that makes ANY sense at all).

thanks for your reaction.