I think the "shadow" betfair (Orbit exchange) allows everyone, contact a broker like AsianConnect or BetInAsia and ask them if you can register, if so, just complete KYC and you have access to several bookies and Orbit exchange from the same platform. I never had problems with none of the brokers mentioned.
A betting exchange doesn't limit you simply because they take a cut from your winnings on each market (in my case it's 6%, but for most people it is 2-3%), so there is no reason to bother you at all, but if you are extremely successful you might get premium charged (forcing you to pay a higher % of winnings on each market), but reaching such a level is unrealistic for most, and still there are several exchanges to consider in case that happens. The only problem would be if you are a heavy bettor and you are trying to place a disproportionate bet on a illiquid market, but stake restriction is not a thing on exchanges.
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