as title states

There is no plan to add it, so why not buy it through the /buy or /spawn command?

Excellent point. Why would a player go all the way to a monument to buy a vehicle, then type a command to claim it, when they could just type a command to buy it in from anywhere in the first place. That seems unnecessarily complicated considering they have to pay for it either way.

so that people who want to be able to purchase minis at bandit camp like your supposed to, but still be able to lock and recall your boats or minis, its okay ill find a different plugin

I see. It sounds like you want the recall feature without the command to spawn it. That sounds reasonable enough to me. One issue with that is this plugin doesn't currently have fine-grained permissions, so you either get spawning and recalling together or not at all.

One way to achieve this is to expose an API method in this plugin to register a vehicle, and to have the Vehicle Vendor Options plugin call that API when a vehicle is purchased. This avoids the player having to run any command. If the player already has a registered vehicle of that type, the registration may need to be skipped, but that may be an acceptable limitation that can be documented.