An off-the-wall thought, and this will still be difficult without the display.....
If they are willing to sell it as-is for less than 1/2 that (I'm thinking $30) you might be able to hook an old PC to in and run it that way (you'd have to guess as to when the radio is in PC control mode during initial set-up but after that you can run all the displays via the PC including alpha tagging which the 898 does not have.
Heck, for $30 you may be able to cover the display replacement.