If you expect them to perform as a single length set would You would have to find a club builder who is prepared to spend the time to do it.
from Wishon Golf
"
CAN A CONVENTIONAL SET OF INCREMENTAL LENGTH IRONS BE CONVERTED INTO A SET OF SINGLE LENGTH IRONS?
Not without either a lot of lead tape on the lower loft heads and a lot of grinding of weight off the higher loft heads in the conventional set. Not to mention the potential difficulty of bending the lie angle of some of the heads to the required lie for the golfer for the one single length chosen. For all intents and purposes, it is just not feasible to build a single length set from an existing incremental length set of irons.
In a Single Length set, all the clubheads must be designed and manufactured to be the same exact headweight AND with the same lie angle. This is a requirement for the Single Length clubs to all end up with the same total weight, same swing weight, same head weight feel and same balance point – the elements that ensure each club exhibits the same swing feel.
Golfers who are interested in a Single Length set are going to have to test hit clubs properly engineered and manufactured for assembly as a Single Length set to be able to try the concept. It is completely impractical to alter an existing iron set to the Single Length concept."
https://wishongolf.com/technology/information-and-qa-about-single-length-irons/