OSR Consumables, arrow recovery

Last month I made a post about the amazing "Consumables" rule I found in the WWII OSR game The Front. As quick reminder, the rule meant you allocated your consumable resource a die type, and as you consumed the resources the die type shrank D20 > D12 > D10 > D8 > D6 > D4 until you had nothing left.

During my recent solo Basic Fantasy/Scarlet Heroes game I had a fight scene where a character ran through is arrows and got all the way down to the D4. That left me wondering about where all those arrows had gone. In normal play DMs tend to have a rule for arrow recovery, such as you can get 50% back, or roll a D6 and recover the arrow on 1-2. Clearly that doesn't work when you are not actually counting arrows. So on the spot I made up the following arrow recovery rule.

After a combat ends, if the PC has reduced the arrow-consumable die by at least one die type (or reduced from D4 to NONE), they may make an arrow-recovery roll. Roll the current consumable die type (D4 if NONE), any result of 3 or more, increases the consumable die type by 1 level.

e.g. During a scene, Wizard character fires arrows into the Death Orc and in the process reduces his arrow consumable die from D10 down to D4. After the combat is over Wizard spends the time to see if any of his arrows are reusable. The PC rolls a D4 (his current Consumable die). His result is a 3, therefore he recovers one die type for his consumable, and notes that his new die type is D6.

Clearly this rule only applies to consumables that can be recovered...bullets, grenades, fire-bombs can not be recovered as they are destroyed in use.