Well just when I got my single shot adapter working they've released these:
https://riflemags.co.uk/tikka-t1x-5-rou ... -magazine/

Tempted by a few.

I have a few on order from Eurooptic... They look pretty nice, and from the pictures I've seen with them inserted into the rifle they make the bottom nice and flat.

all that effort and it turns out someone over there at Tikka had some common sense to realize how obtrusive that original magazine was.