In Sweden, check with Peter Almgren, Longbowgolf. I think he is bpa59 or something on here. He has alot of different shafts and heads. Check his site.
Trial and error works too

Other than that, go to events and talk to players. Ask what they use and I´ll bet they will let you hit a few to try out. The problem with getting the right gear is if you have somewhere to measure what is needed, there is seldom many things to try or vice versa. Sorry

Or buy a LM yourself, a decent one at 7-8k Euro, and save yourself 2-3 years of testing

It took me 3-4 years to get dialed in decently, still searching though as the swing evolves. Best tip is lend a club indefinetly, as soon as you buy it, it´s BAD
