My A/C still works but the evap is leaking. So one project this year 'could' be a complete refresh of the system.

Parts already here:
93+ evap
new Schrader valve inserts (eB China)
new A/C o-rings (R134a)
new dryer (R134a)

As it's leaking oil to a unknown degree it was always a wild guess of how much oil to be added every two years. So I'm going to flush the whole system with A/C chemical solvent and dry it with nitrogen 2.8. Anyone else did this procedure? New PAG 46 oil will be filled in the compressor directly.

One question about the suction and discharge hoses. They're out of production and have been very expensive. You get what you pay for. But what about the A/C hoses which can be found on eB in the US for $20-25. Or should I go a different route and ask an A/C shop (actually very hard to find here) to custom build me some based on the fittings and size of the old ones? Or should I just reuse my 30 years old ones?