Just some update, I did undertake a journey last evening and will also write a full trip report on this separately.
I did not eat any fatty foods 36hours prior to this. And on this day, I only had a huge smoothie (bananas, grapes, greens) around noon before drinking the medicine.
I dosed:
250mg freebase harmala isolate +
70mg freebase DMT
together into about 250ml of orange juice.
The harmalas seemed to dissolve very easily and quickly. the DMT however took a long time.
I followed the advice by Jees and heated the glass up in a water-bath and did about 10-20min of swirling, I could still see some DMT fragments floating around, but I think it mostly dissolved.
I drank this rather quickly and right after prepared another smoothie consisting out of four bananas to activate digestion.
Could only finish half of it however, since it was hitting me hard just 20minutes after drinking the OJ!
Had a very intense comeup and quite intense tripping for the next 4hours.
Was so happy that I did not had to purge, came close once but only felt better the more time passed on.
Thanks everyone for your advice!
Taking the harmalas and DMT together seems to work very well for me. Pretty sure the empty stomach and dietary restriction beforehand also helped.