reduce fingerprints len by 32.5% to reduce descriptors size

I have read proposals to reduce descriptor size and found fingerprints use SHA1, why not use base64 for them to change for example: moria relay:

SHA1:

string(40) "9695DFC35FFEB861329B9F1AB04C46397020CE31"

base64 without trailing padding:

string(27) "lpXfw1/+uGEym58asExGOXAgzjE"

pseudocode for example:

substr(base64_encode(hex2bin('9695DFC35FFEB861329B9F1AB04C46397020CE31')),0,27)

results into 32.5% less fingerprints stringlen.