Looking this over, I think that rear sight is made specifically for that rifle, it doesn't look infinitely adjustable.
Another thought, what is the hole spacing for scope bases? Mine both have scopes mounted or I'd check. If it is .860 which is common for scope bases, Skinner makes their "860 Reliable" rear sight which comes with .860 holes. It's low profile and rugged as hell. Mine will fit both a Winchester and a Ruger 10/22 receiver although in that flat topped Tikka you might have a hint of daylight under it. Combine that with a Lyman or Marbles ramp front of appropriate height which is pretty easy for a gunsmith to install and you'd have a very rugged and low profile set of sights.
Skinner also makes sights to fit the dovetail on rimfires, one of which works for a CZ. Again, you'd have to measure the dovetail (11 or 13mm I think) so one of those might fit the Tikka. he says if your rifle isn't listed on his website for them then don't ask, but if you're interested you still might email to ask what the groove spacing is on his various models.