Implied value is ~54c AUD today (0.82*1.128*0.5834).You can't...

Implied value is ~54c AUD today (0.82*1.128*0.5834).You can't sell ATHA shares until after the implementation date (April 11th), so the implied value will change between now and then.

There's an option for a Sale Facility if you have 171409 92E shares or less - your shares will be registered with ATHA, who will have a broker sell the shares for you in the 20 day period following implementation, and at the end they will give you the money raised by the sale of your shares in AUD. That will require that you register via Automic by 5pm AWST on Tuesday April 2nd.

After that, you'll probably need a broker that can handle TSXV shares.

That's my summary - hopefully quite accurate but definitely check out the Scheme Booklet (announcement on 21 Feb) for the official word.