Mr Chalerm said the 99-member reform panel would comprise 77 elected representatives of the people, one from each province, and 22 appointed scholars.
The election of the 77 members would be organised by the election Commission. The EC would also have authority to select and appoint the 22 scholars, he added.
Once the reform council had finished the charter rewrite, a national referendum on the altered constitution would be held, Mr Chalerm said.
If people approved the new draft constitution it would be promulgated, and after that the House of Representatives would be dissolved to allow a general election, he said.
Mr Chalerm said his proposal conformed with legal mechanisms and it could be put to work immediately, in parallel with the Feb 2 elections.
The national reform council proposed by caretaker Prime Minister Yingluck Shinawatra would take a long time to complete its work. This was a weak-point the People's Democratic Reform Committee (PDRC) could use to justify continuing its rallies, he said.