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PHP, 95 93 89

#<?=strtr(g.[ggggg,hghgh,ghhii,jhjij,hijkk,hijkl][strlen($argn|aa)-2],_ghijkl,$argn.'0');

Basically @JörgHülsermann's answer but greatly golfed down so I decided to post it as a seperate answer. I'm pretty sure this can be golfed even further even though I would like to beat @user63956's great answer.

-4 bytes thanks to @JörgHülsermann

PHP, 95 93 89 87

<?=strtr(_1.intval([a6n,sot,c8c,lba,vf1,vf2][strlen($argn|aa)-2],33),_134256,$argn.=0);

Basically @JörgHülsermann's answer but greatly golfed down so I decided to post it as a seperate answer. I'd count this answer as an collective effort of me and Jörg.

-4 bytes thanks to @JörgHülsermann
-1 bytes thanks to @JörgHülsermann's base 33 numbers

PHP, 95 93

#<?=strtr([gggggg,ghghgh,gghhii,gjhjij,ghijkk,ghijkl][strlen($argn|aa)-2],_ghijkl,$argn.'0');

Basically @JörgHülsermann's answer but greatly golfed down so I decided to post it as a seperate answer. I'm pretty sure this can be golfed even further even though I would like to beat @user63956's great answer.

PHP, 95 93 89

#<?=strtr(g.[ggggg,hghgh,ghhii,jhjij,hijkk,hijkl][strlen($argn|aa)-2],_ghijkl,$argn.'0');

Basically @JörgHülsermann's answer but greatly golfed down so I decided to post it as a seperate answer. I'm pretty sure this can be golfed even further even though I would like to beat @user63956's great answer.

-4 bytes thanks to @JörgHülsermann