I assume it is not possible but will ask anyhow
can matmid points be used for or transferred to any other carrier?

nope.

in the past they could be used for qantas. not sure if still possible.

You can redeem only on LY operated flights.

see here -

https://www.elal.com/en/FrequentFlye...-Partners.aspx

aeromexico and alska airlines only partners to earn matmid points.

Qantas is a partner you can also redeem your matmid points, but this can only be done through the call center

Can they be used for tix on any other carriers save for LY maybe codeshare?

You already asked and it was already answered.

Matmid points

with all the negative press LY has been getting lately decided to drop our fly cards. Now using Max Which works with UA
did not know what to do with some 9000 matmid points between me and the wife.
I even queried here about selling to a points broker. (Very grey area)
We�ll FWIW finally found a legit way to dump the points.
till 30 April on the matmid site one can purchase Buy-me cards. 210 points gets 300 shekels. 140 for 200 and 70 for 100.
So got us about 11000 shekels of buy me cards good for five years if activated by April 30.
accepted at many major household and fashion stores and even iirc Shekem electric (can you say new iPhone?)
probably more practical and less suffering than having to deal with LY.
happy holidays.