You run smack into the timing problem. Most of the P-43 orders were to keep Republics work force together and expand it while waiting for the P-47 to be ready.
The last P-35 was delivered in Aug 1938.
Republic is fooling around with two earlier aircraft as racers.
The last P-35 airframe is modified into the AP-2 (XP-41) with the P W R-1830-19 two stage supercharged engine and inward retractiing landing gear that fits flush instead of the rearward semi-retractable gear of the P-35. This plane is delivered in time for the 1939 Army fighter trials.
Another airframe is completed as the AP-4 with a turbo-charged R-1830. It is this plane that will become the YP-43.
"On March 12, 1939, thirteen service test models of the AP-4 were ordered by the Army under the designation YP-43".
The Army had ordered 13 YP-37s with turbos back in Dec 1937 but the first one is not delivered until June of 1939.
In the Spring of 1939 the Army figured that service turbo charged planes were about two years away which is why they ordered the P-40. The YP-37s proved them right.
"However, the YP-37s continued to suffer with the same supercharger problems of the X-model and did not live up to their potential. All but one of the YP-37s were out of service or retired to mechanics' schools by early 1942. The highest-time aircraft had only 212 hours."
The First YP-43 is not delivered until Sept 1940. In the mean time the Army had ordered 80 P-44s with turbo R-2180s in Sept of 1939, one year earlier. Even earlier (Aug 1939) Kartveli had proposed (in response to an army request) a small, light weight Allison powered fighter, the AP-10 which was ordered as the P-47.
By Sept of 1940 the army had decided that both the P-44 and the P-47 (which had grown several times during the year) did not have enough potential for future use. This was helped by Kartveli, who, becoming dissatisfied himself with both the P-44 and XP-47 had roughed out the R-2800 powered P-47 design and shown it to the army.
In Sept 1940 the Army cancels the P-44s and switches the Allison powered P-47 for the R-2800 powered P-47. Because the R-2800s won't be ready in time a stop gap order is placed for 54 P-43s. This quickly followed by an order for 80 P-43As. First P-43s (not YP-43s) are delivered in Sept 1941.
IN June 1941 a further 125 P-43s are ordered as lend lease for the Chinese and again, to build up Republics work force and Factory as by this time over 1000 P-47s are on order. 773 R-2800 powered P-47s had been ordered back in Sept of 1940.
Time spent futzing about with an Allison powered P-43 is only going to delay the P-47.
Designing a new airplane using a turbo Allison instead of an R-1830 and 'calling' it a P-43 is only going to delay the P-47 even more.
The P-43s that did go into service did NOT achieve an enviable reputation. Much like the Army thought, the turbo installation wasn't really ready for service use, troubles being experienced with the turbo controls, The self sealing tanks leaked with normal use let alone combat damage.
"The USAAF always viewed the P-43 as only an interim type and considered it unfit for any combat role. None of the USAAF P-43s ever saw any action, being used strictly for advanced training in Stateside units."
A total of eight P-43s modified for use as photo recon planes were give to the Australians in 1942 (six in Aug and two in Nov) the surviving six were given back in 1943.