yes, you can use regular type. i’ve been using the Kingsley for about 2 years with no real concern on wear with the typefaces i own. i do use fresh type. i bought several from belltype. there is nothing like fresh type. so crisp and accurate. however, i also use old ebay purchased typefaces too. it just depends on your project. plus, you don’t leave type in a hot machine when not using it etc etc. Most type is 18 point body. you can use anything as long as it is cast on 18 pt body. for example, i have some 10 pt typeface on 18 pt and so forth. as well as just a lot of 18 pt. there is also a 12 pt type holder. Kingsley has lots and lots of accessories. it was an amazing company. if you check that facebook link i gave you, there are a lot of snaps of some of the more popular type holders.
you can have magnesium or brass dies made that slip into a special typeholder Kingsley made. i haven’t yet. but it was very popular back in the day to have your company logo made and use a Kingsley 72 pt type holder to print with.
i’ve been researching Kingsley since i bought my machine. it’s super interesting. they owned one of the biggest type foundrys in the states. it was the beginning and end for both companies.
ps. wait until you see all the amazing foil colors out there!