Is possible bro..
a condo with 15 years, regardless of fh/lh, u will need consent from the developer at first.
Some developer they count bumi-lot by ratio, normally 10% of total units, didn't actually fix which are bumi and which are non. If by ratio, it will be easier, but time consuming will be your main concern. Expected will be 6 months if u're lucky, otherwise, 1 years+.

Some developer fixed the unit as bumi and non. In which, this is troublesome, process may take up to 1-2 years+.

I supposed you will need to pay your legal fee for the search, appeal, etc legal services even though if you pull out from the deal.

Make sure you did mentioned on your offer to purchase form regarding if transfer unsuccessfully due to rejected of transfer bumi to non-bumi, u will get back your downpayment. Otherwise, things might change, which happen most of the time, that u got no written evidence stated u can get back the deposit.