Deteriorated Weatherstripping

I have very old aluminum storm windows and all the weather stripping has deteriorated and some is missing. Unfortunately the channels are permanently closed on each end so I can't slide a new strip in. Is there a way to insert a narrow strip of weatherstripping into the channel from the top. The depth of the channel is about 1/4". The bottom width of the old weatherstripping is about 3/16ths. The width of the top of the channel is about 1/8th In. Would it be possible to find a size that I could push into the slot from the top seeing as I cannot slide it in from the side? Perhaps a narrower bottom width with sufficient nap to make a seal. I have about 40 old aluminum storm windows that need new weatherstripping. That makes at total of about 80 individual panes when I count top and bottom. Replacement would be a horrendous cost. Hoping you have a good suggestion. I figure I can work on it off and on during the summer if there is a way. Many thanks for your consideration and input. Mary