You can get an Icom A-210 to slide directly into a SL-40 tray without any wiring changes if you have the Icom retrofit radio back plate. Easy to swap with the original radio back with the retrofit SL-40 radio back plate. There is directions online to make the change.
The Icom part number for the back plate is MB-113. The retail price was $75, just to give you an idea what it is worth. These are not available from Icom anymore as I had called them when I was given an A-210 last year. I asked here and found one. Ask and see if anyone is willing to sell you one if you find an Icom A-210 cheap. They came with the radio, and if someone installed theirs with the Icom rack, they might have theirs laying around somewhere.
It is not the best radio, but it will work for you application.
You also might find someone in Europe that has a SL-40 laying around when they swapped it out for a 833KHZ radio.
Here is someone who has the back plate and is willing to let it go.