We advise you to write to HDB who will assess your situation on a case-by-case basis.
Hope this answers your question.
Even if you sell you Johor property, you still need to wait out for 30 months before you can apply for BTO.
You may want to consider resale hdb instead.
Feel free to contact me if you have other questions or interested to explore what other options you have. Have a great day.
Associate Group Director | Propnex Singapore
BSc Business Analytics
Dip. Building & Real Estate Management