Well ... the further question is - have your colonies suffered from chalkbrood and nosema ?
Chalkbrood is rarely something that kills a colony, it's often present in early spring - particularly when it's cold and damp in the early spring build up. Very often signs of chalkbrood will disappear as the weather warms up. If you are seeing large amounts of chalkbrood present in the colony throughout the season the perceived wisdom is to replace the queen. Unless your colonies are seriously threatened by chalkbrood you may be worrying unnecessarily.
Similarly, Nosema - people mistake short term dysentry in a colony for Nosema Apis - a few spots of bee faeces on the front if the hive is not unusual, but it may not be Nosema. Nosema Ceranae will only manifest itself when you see a colony that is seriously weakened there will be few visible signs and no dysentry. If you suspect either variant there is a simple test for both types of Nosema and you should be either testing yourself or getting someone with a microscope to do it for you. Hivemaker had a formula (sticky on this forum) for treating and preventing Nosema using Thymol.
https://beekeepingforum.co.uk/threads/hivemakers-thymol-recipe-see-sticky-post.13381/
It strikes me you are looking for prophylactic treatments for both chalkbrood and nosema and the reality is that they are both carried by the bees and you are looking to treat frames of comb to either try and prevent something that may occur - so why bother ? When, perhaps, you should be thinking about whether your colonies are inflicted with these infections and in the case of Nosema - treat the bees..
But ...Like I said previously ... if it ain't broke, don't fix it.