I was looking at different link functions for binomial glms recently for the same reason as you (more zeros than ones). I did a bit of reading up on the various link functions and IIRC, you can use the cloglog link on your data, just turn your 0's into 1's and vice versa. This was stated in the one or two references I looked at as to why only one of cloglog and loglog links is often provided in software
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