Yeah, stranding is easier done in the round but you can do it flat.
It would be a good time to learn steeking
You could knit
two blocks in the round with a steek between them, making sure that
they are slightly smaller than required, then go back and pick up
stitches around to make a finished border. I've actually done that
with a pillow cover I was practicing steeking on so don't see why it
wouldn't work for a block. Or just do do the stranding flat, lots
of people don't like it in flat knitting because it is harder to get your
colors placed correctly on the wrong side rows.
Not sure it all sounds like a lot of work actually hehe I'm trying to
get a ton of Christmas knitting done because it looks like I'll be in
good ole New Mexico this Fall sometime visiting my family so I'd like
to be able to take all my knitted gifts with me rather than having to
Blah blah blah...I always seem to go on and on when I