I imagine that full rubber soles are just as difficult to Topy, unless you are suggesting that I dispose of the shoes and get a new pair. But I was hoping for the boots to last as long as the leather holds up, not for only as long as the heels and soles hold up. Despite the salt damage, I expect the leather uppers to last longer than the rubber soles.
You don't put Topys on full rubber soles and heels - they are already made of rubber! And the rubber is single unit made up of heel and sole. Have a look on the net, for Dainite soles, for an example. The same company make a much more heavy duty unit called Commando, too.
In your message, you said that you were going to buy new shoes - future tense. If you haven't bought them already, do consider the rubber soled and heel varieties. If you have bought them, already, it depends on what you paid for them and whether or not you can afford another pair. From the point of view of their being winter shoes, you need to consider if the uppers are fit for 'weather'.
I'm sorry to be a big gloomy but I hope this helps! Munky