Quick overview of the topic. so long as you rev match the harm is not that great on the gears. I sometimes wont use the clutch on the V85, more on 4-6. it is easily do able without the use of another device. A slight clunk is not bad, grinding noises are.
"While some motorcycle transmissions may incorporate synchromesh for smoother engagement, especially in certain touring or cruiser models, the vast majority of sports and racing motorcycles use unsynchronized, dog-engaged gearboxes.
These are often referred to as "dog boxes" or "sequential dog boxes" and are designed for rapid, precise shifting, often without the need for a clutch.
The absence of synchromesh means that riders must manually match engine revs to gear speeds to avoid grinding, but this also enables quicker shifts, which is critical in racing environments."