B4.1 expert advice on converting to wheel hex

[Capper]

Hi peeps just gone and bought an b4.1 for my son to use and was planning on him usin my my old wheels/tyres etc ive got an b6.1 and now just found out out that the b4.1 uses pins and bearings for the wheels and on an hex like the b6.1 my fault for not doin the research!! Is there any way i can convert the b4.1 to wheel hex? Thank you