Not an authority on this subject but I did some limited research. First of all I don’t think custom made club from Mizuno will cost you more, except you may not get any discount. I was thinking of a custom made set of Callaway but no shop can offer such service, my coach advised me to buy a standard set and ask a qualified workshop to change the lie angle, which should cost around HKD80 per piece. Considering the cost of your iron, I don’t think this is a hurdle. The real challenge is to find a shop that can either arrange custom made clubs for you (for my case is Callaway, you can go directly to Mizuno direct shop), and what option of shaft or range (e.g. 9-5i) are available. If you cannot custom made on lie angle then find a pro shop to help you. Any deviation from standard set would mean less or no discount, but if you never use the standard S, P, 3i anyway then you can find the saving plus more environmental friendly.