Hi Dave, it depends if your bike is under warranty or not, if it is you will need to use an OEM filter and the recommended oil, also keep the receipts, you can home service your Triumph even under warranty, provided you use OEM parts and keep a record of the service. If it is not under warranty then the Hi Flow filters are fine, also use a new sump plug washer.
Yes use Hi-flo filters regularly, in the family we have a total of 5 bikes that all use the same filter, my T100 and 800 Tiger, sons Blackbird, grandson 1 has a Honda CB500x and grandson 2 a Honda CBF600 and it was good old grandad who bought a bulk supply!!!