5 kilograms of seed? I agree, not a good idea. Have a few packs, (15 to 30 grams tops) sent by DHL...very good as they by-pass Jakarta, or even try the mail, (with no value declared), and have them described as "spices as gift.”
"Chinese durian" I agree, they are much better than the indigenous durian found here. As you say, they are much larger, and they yield almost twice as much fruit as local durian. My wife LOVES Thai durian!
Avocados do very well in Bali. Our good friends, Ben and Blair, who started off with organic farming in Bali some years ago, have had great success with avocados. It's pretty funny actually. Who, 5 years ago, would have even dreamed of locally grown avocados?! But, from what I’ve been told, (by Ben and Blair) it’s better in the north of Bali for these kinds of vegetable growing.
You say you want to introduce some plants common in Scandinavia to Bali. Why not? But as you well know, many plants do not do well in climate variations…and Scandinavia to Bali is about as extreme a climate variation as one could possibly imagine. But yah! I think what you want to try out is superkalifragisticexpradalagogous! Why not try?
If you ever want some good lotus seeds from the lotus pond at the Pura Saraswati in Ubud, just let me know. These seeds are about the size of a black olive, and the plants they yield are immense and the flowers about the size of a dinner plate.
Good luck with your botanical experiments.