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Imagine a Hive Treasury Company that us 95% of profits to buy Hive on CEXs and converting then to HBD (burning 5% in process) Using then that HBD to buy Hive in the internal market.

That would make it closer to a stablecoin. It would be better if it was used for curation.

No, that will drive the price out. Because you are taking away 100% of profit off the market.
Buy Hive convert HBD onchain (with 5% Burn) then use the HBD to buy Hive in the internal market.
Then stake it for Curation or put all in Savings for lock up.