A Rudy Sarzo
https://www.ebay.co.uk/itm/286848346883?itmmeta=01K6DR4MBW8VF3PEH2F7MC1PWQ&itmprp=enc%3AAQAKAAAAwMHg7L1Zz0LA5DYYmRTS30kFBeKoU6WhBMrXkslWIZupLM8MwYKjW559xbxG2xo9WJ3NkSEYEXDLRcbEwhzn1uIz8wkDi25wZSKGDriHpMenTR2HHphY%2Bn9LZvi5XNeVJWJ4iElVorPZdUYE0rAzul1LYICd8vwDnjJZZFWH2H%2BtzlLB%2Bshl9iVsO7fi9BdxUL7usoi%2BLs00kxJ%2Feichro5cR8BH9reROLmERQ2RG1QAfZ9HkbGQuK2LqFjXlo1ubw%3D%3D|tkp%3ABk9SR47GkrizZg
and an RJ-IV Randy Jackson
https://www.ebay.co.uk/itm/286848234235?itmmeta=01K6DR4MBXK09PNFMGEDXVJHF0&itmprp=enc%3AAQAKAAAAwMHg7L1Zz0LA5DYYmRTS30kmr250zhKDbUsC%2B6jbKEOg4u0hCZFh974x51IeFtHS9CVu43c%2BpgEMsjZYOCEtUOsoVOcLfTjbL16PnVqJF%2FkefpCLpW9HD6WDUxPIfXoBcifn3pmMh6fbZf%2FZqha9JE54UwL3Lu8POLp6outbLcHmlaHFD6H%2B1zKbychHPj%2BrhcnACPfocyTinVwDKy41qZdxcJfoiKOoRVUfaMchFz%2FlXdl1FYIG7acgzE6zpRnujw%3D%3D|tkp%3ABk9SR5DGkrizZg
It's quite possible to string a four-string BEAD (use the bottom four strings from a five-string set).
It might be confusing, so you might want to use something which doesn't feel like your main four-string.