The way I read it / have seen, Motoconcepts are an established team, with a fair amount of support.
So, perhaps they don't /won't need money or parts donations. Those things perhaps should be held back for a TSM effort, if attempted again.
But if they respond saying any help is welcome, then go ahead and help them.
The way to support their effort, I think, If they are the team I think they are, is by buying product from them, contacting them and letting them know of your support and how you've picked up on them through this very welcome support of a 2t, and even contacting, buying product from their various sponsors And letting the sponsors know your spending has been influenced by this 2t support.
That is the sort of thing that can really register with sponsors - it is the (major) reason they sponsor teams / riders.
Spreading the word through the various Internet forums about this, praising those involved in it, is another great way to thank those behind the effort. Good publicity is what it's all about.
Why KTM didn't think of this sort of thing with Cedric is a bit surprising - they must have seen the publicity he / they got from his Euro efforts in the GPs and Euro SX. Quite a missed opportunity for them , I'd say.