Hi Enquerer,
Welcome. Your Adventurer has many similarities to the Thunderbird and Legend, so you have many options for spares and alternative extras. The bikes are modular, and when you tire of the Classics, there are a few (performance) options from the other T300 series bikes to explore.
This is a company in Germany I have purchased a couple of things from, that you may like their link?:
sbf-motorraeder (triumph-bikes-parts)
If the local Triumph dealer has a number of these bikes left, there are alot of riders missing out on a great bike experience. I'm sure you will enjoy your Adventurer.
There is another Forum I visit, and they have a Section for Adventurer owners, and is also good for help when needed. There maybe some useful information in their history, and it may be interesting to ask about the Slash Cuts there as well:
Triumphridersite.com
Geoff