Triumphs have quite a good community and even parent company support for self maintenance. More so than Ducati & bmw.

Owners could subscribe to the official triumph technical service manual as a paid service that's open for everyone.
Access to dealer technical manual that is usually limited to dealer network for other brands.


And for dtc check, fault code correction, service reminder reset and some other basic ECU config can be done through this software.

Triumphs tho it's marketed as a premium brand, most of the engine consumables are designed around generic parts that is used by Honda, kawasaki, Suzuki and other jap parts.
Generic oil filter like those used by kawasaki and honda
Generic spark plug size like those used by versys and Honda cb

Quite cheap to run.

Conti bikes is always a bit more expensive than Japanese bike to run and maintain.
But my God they are much nicer to ride and be on compared to japs.

Go for a test ride and see if they're worth the extra. I find that there's just no competition in jap midweight adventure bike to conti. But for Cafe racer might be different.

The Honda CB650 is probably a direct competitor for the trident.
For outside servicing you can try and refer to rawtech bikewerks. A very popular mechanic for triumph, but he handle mostly tigers. Doesn't hurt to ask.