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Delayed load procedural, hold last frame


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Hello, I have a little problem with holding last frame in delayed load procedural. Im creating a spruce tree from lego, It has 20 floors. Every floor has its specific cache. So I create a one branch, say 250 frames cache. Then i copy it three times with delayed load into circle and have one floor. Same proces with other 19 floors. I have set of HDA where i can time shift cache.  Thats works perfect. I need this setup because of fast ifd translation for use our full farm potential. Last frame of one branch has 2.5 Mil poly. Instance object works weird. First, it is so slow to copy all lego peaces and theres no help in translation, because it translates all lego pieces and in final stage we are speaking about 200mil poly. i have no problem with caching single branches. Translation is super fast render too. But, There is relatively long time between fist cache and last cache. So first branch ends at 250 but the last start say at 1000 frame and ends 1250. So first growing branch disappear because I have only 250 frames cache. Of course there is no problem to cache last frame to 1000frame. But It has 2.5mil poly and saving is slow. And ill have 20 floors. So, one little change and all resave again. Perfect will be if in delayed procedural will be something like hold last frame or use another file if cant find primary cache. The best way should be as alembic file. If theres no cache, holding first or last frame.  Or find some program which can duplicate file with increment. Or what do you thing? Thanks a lot. 

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