Personal experience:
I tried a plate hx with threaded connections. I used a thread sealer and an impregnated pipe 'string' (I use this in day to day plumbing with wáter and never get leaks).
No problem at all on the wáter side but the refreigerant side leaks on both connections, a very slight leak that is undetectable to testing with soapy wáter but became evident after about a month or 6 weeks of 24x7 use as there was oil seeping from both the joints.
Mini Project for the summer - braze the two joints.
If you are concerned about wanting to modify your system then why not braze a short piece of tube to the hx and then put on a flange nut fitting?
Acuario
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