Custom Trade controller

Some mods (for example, my mod or this one) need such functionality:
1) The user (player) buys something from a trader
2) Instead of delivering the item the trader messages the player, or increases player's EXP, or puts a quest item into his quest stash, etc

To achieve this all such mods have a class extending the spt TradeController, with a method that usually looks like this:

confirmTrading(pmcData, body, sessionID) {
    if (body.tid == TRADER_ID) {
        // do stuff we want, return what we want 
    }

    // IMPORTANT: if body.tid (trader's id) is not our trader, return standart confirmTrading
    return super.confirmTrading(pmcData, body, sessionID);
}

and register it like this:

container.register("CustomTradeController", CustomTradeController_1.CustomTradeController);
container.register("TradeController", { useToken: "CustomTradeController" });

--

So essentially it replaces the entire TradeController implementation in the container. So if another mod tries the same thing, only one can win. Whichever mod is loaded last will be the only one that actually overrides TradeController.

Another option could be intercepting /client/game/profile/items/moving via staticRouterModService.registerStaticRouter, but it's when the trade happened and items were already added/removed - which doesn't work for my case.

Is there any other option to intercept standart trading, and either run my custom logic or pass it forward, without damaging other mods functionality?