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I did this simply because I already had a down jacket and was looking for racing kit.
For normal camping I've got my ancient down bag but I need another one if the missus comes with and I only have a summer and winter bivvy, not two of each, so again for the Scotland trip we were thinking of doing I was going to buy a bikepacking tent.
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Don't know if anyone mainstream does synth half bag/jacket
When I was in your position everyone on here heckled me enough about the synth bags that I bought a second hand down bag from the bay and decathlon mat. I think I curated a list of "somewhat reputable" sleeping bag manufacturers that you could plug into ebay further up thread.
I feel like one of these days surely someone has to make a break through on the synthetic down thing. It doesn't sound like anyone actually wants real down but end up obliged to because synth has such relatively bad packability.
Should be quite a bit cheaper then. Might be bulkier though for same warmth.
Depends on temps and how you sleep though of course. I raced with no sleeping bag but it's shit if you're trying to enjoy yourself. My current setup is more sleep friendly and involves half bag and down jacket but £££