MG Barnes, the quixotic manager of Army Ordnance tank programs, had already ordered 1200 T-29 and 600 T-30, of which T-29/30 were reduced to 1152/504 on 12Apr45. I suspect that the rush to production would have required just what you mentioned. The first pilot T-29 was assembled prior to the end of the war but most priorities were slackened already upon the Japanese acceptance of terms so we cannot estimate how many production tanks could have been shipped to the Far East even if the acceptance trials went well.
Barnes had no authority to order tanks, that was ASF and General Somervell.
On 1 March 1945, OCM 26825 recommended procurement of 1,200 Heavy Tanks T29, even though Pressed Steel Car Company had barely begun production of the first two pilots. Army Service Forces approved procurement of 1,152 on 12 April,
Ordering tanks from the blueprints, seems like a recipie for long and numerous design alterations and refits before they were deemed combat ready.