I am not at that familiar with the Micro Swiss components, but assuming that it is all M6 threaded below the motor block you can just purchase similar parts to the originals on eBay inexpensively.
It claims to be MK8 compatible and from what I can see in the link it appears that it should work.
Such as this-
(Just use your 24 volt heater instead of the 12 volt one)
I am sure that FT will return to life once this pandemic abates, but in the meantime there are other sources for these types of things.
Be a bit careful with the anti-seize, don't get it into the bore.
I use heat sink grease instead.