With reference to your ABS question, the biggest change that upsets ABS systems is the inertia of the wheel and tyre combination. If your new wheel and tyre are larger diameter and/or heavier than what the bike originally had, then the ABS system will struggle to prevent deep wheel slip in a harsh braking scenario. This could prove to be dangerous.
Other things to check are that you must keep the original wheel speed sensor and original polewheel. Or if the bike uses a sensor built into the wheel bearing, that same sensor bearing must be used on the new front end. If you change the wheel speed sensor set up on the front wheel away from what the ABS ECU (computer) is expecting, it won’t work properly.
If the volume of brake fluid in the front master cylinder is altere from the OE fit master cylinder, the ABS system will either dump too much or too little fluid in a wheel lock situation, meaning you might actually run out of lever travel and be unable to stop.
Without knowing the specifications of the original front brake setup and the new front setup, I can’t say whether it would be safe or dangerous.