Problem woth gamertag

[Mywalkokos]

In short i started playing warframe on pc and then decided to buy console and sell my pc. Now i merged accounts or whatever and its working fine BUT on pc i was mywal and on xbox "mywal" was taken so i had to get creative and came up with mywalkokos. Now i would love to use warframe market but my name on forms is mywal but ingame its mywalkokos so people from wfm cant msg me and i really dont want to pay either 200 plat or 8$ (xbox gamertag) to change it so now i dont know what to do.