Many thanks for the reply.
Regarding the transactions, I was not able to find any reasonable estimate of how much accountants would charge for, say, 25k+ crypto transactions (long/borrow/short). Do you happen to know much is charged charged in such︀ cases? Obviously, I could export the transactions to accounting/cryptotax/cointracking or script a data dump in︁ any required form.
As for tax legislation, no surprises or simplifications to be expected then︂ - trading through the LTD apparently remains the only feasible way.